feat: refactor settings components and sidebar layout

AGENTS.md

@@ -28,11 +28,12 @@ Workspaces:
 ### Core Components (UI)
 In `packages/ui/src/components/chat/`: ChatContainer, ChatEmptyState, ChatErrorBoundary, ChatInput, ChatMessage, FileAttachment, MarkdownRenderer, MessageList, ModelControls, PermissionCard, PermissionRequest, ServerFilePicker, StreamingTextDiff, AgentMentionAutocomplete, CommandAutocomplete, FileMentionAutocomplete.
 In `packages/ui/src/components/chat/message/`: MessageBody, MessageHeader, ToolOutputDialog, DiffViewToggle, FadeInOnReveal; parts/ (AssistantTextPart, ReasoningPart, ToolPart, UserTextPart, etc.)
-In `packages/ui/src/components/layout/`: MainLayout, Header, Sidebar, SidebarContextSummary, SettingsDialog, VSCodeLayout.
-In `packages/ui/src/components/sections/`: AgentsPage, CommandsPage, GitIdentitiesPage, ProvidersPage, SettingsPage (with subsections for agents/, commands/, git-identities/, providers/, settings/).
+In `packages/ui/src/components/layout/`: MainLayout, Header, Sidebar, SidebarContextSummary, VSCodeLayout.
+In `packages/ui/src/components/views/`: ChatView, GitView, DiffView, TerminalView, SettingsView.
+In `packages/ui/src/components/sections/`: subsections agents/, commands/, git-identities/, openchamber/, providers/, shared/.
 In `packages/ui/src/components/session/`: DirectoryTree, DirectoryExplorerDialog, SessionDialogs, SessionSidebar.
 In `packages/ui/src/components/ui/`: CommandPalette, HelpDialog, ConfigUpdateOverlay, ContextUsageDisplay, ErrorBoundary, MemoryDebugPanel, MobileOverlayPanel, FireworksAnimation, OpenChamberLogo, OpenCodeIcon, ProviderLogo, ScrollShadow, OverlayScrollbar, plus Radix-based primitives (button, dialog, input, select, etc.)
-In `packages/ui/src/components/views/`: ChatView, GitView, DiffView, PierreDiffViewer, TerminalView.
+
 In `packages/ui/src/components/terminal/`: TerminalViewport
 In `packages/ui/src/components/onboarding/`: OnboardingScreen
 In `packages/ui/src/components/providers/`: ThemeProvider
@@ -78,8 +79,19 @@ bun run vscode:build          # Build VS Code extension
 
 ## Key Patterns
 
-### Section-Based Navigation
-Modular section architecture with dedicated pages and sidebars. Sections: Agents, Commands, Git Identities, Providers, Sessions, Settings. Independent state management and routing.
+### Settings View Architecture
+Full-screen settings view (`SettingsView.tsx`) with tabbed navigation. Desktop: sidebar + page side-by-side with resizable sidebar. Mobile: drill-down pattern (sidebar → page with back button). Tabs: OpenChamber, Agents, Commands, Providers, Git Identities.
+
+Each settings section has a sidebar (`*Sidebar.tsx`) and page (`*Page.tsx`) in `packages/ui/src/components/sections/`.
+
+**Shared boilerplate components** in `packages/ui/src/components/sections/shared/`:
+- `SettingsSidebarLayout` - wrapper with bg, scroll, header/footer slots
+- `SettingsSidebarHeader` - "Total X" + add button
+- `SettingsSidebarItem` - list item with title, metadata, selection, optional actions dropdown
+- `SettingsPageLayout` - centered max-w-3xl scrollable container
+- `SettingsSection` - section with optional title, description, divider
+
+Use these as reference when adding new settings sections. See `index.ts` for usage examples.
 
 ### File Attachments
 Drag-and-drop upload with 10MB limit (`FileAttachment.tsx`), Data URL encoding, type validation with fallbacks, integrated via `useFileStore.addAttachedFile()`.
@@ -129,7 +141,8 @@ Backend: `packages/web/server/index.js` with `listLocalDirectory()`, `getFilesys
 `SessionSwitcherDialog.tsx`: Collapsible date groups, mobile parity with MobileOverlayPanel, Git worktree and shared session chips, streaming indicators.
 
 ### Settings & Configuration
-`packages/ui/src/components/sections/`: AgentsPage, CommandsPage, GitIdentitiesPage, ProvidersPage, SessionsPage, SettingsPage
+`packages/ui/src/components/sections/`: AgentsPage, CommandsPage, GitIdentitiesPage, ProvidersPage, SessionsPage, OpenChamberPage
+`packages/ui/src/components/sections/shared/`: Boilerplate components for new sections
 Related stores: useAgentsStore, useCommandsStore, useConfigStore, useGitIdentitiesStore
 
 ### Git Operations

CHANGELOG.md

@@ -4,7 +4,11 @@ All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
 
-- Optimized session activity status handling.
+- Redesigned Settings as a full-screen view with tabbed navigation.
+- Added mobile-friendly drill-down navigation for settings.
+- ESC key now closes settings; double-ESC abort only works on chat tab without overlays.
+- Added responsive tab labels in settings header (icons only at narrow widths).
+- Improved session activity status handling and message step completion logic.
 
 
 ## [1.3.6] - 2025-12-27

packages/ui/src/components/layout/MainLayout.tsx

@@ -1,7 +1,6 @@
 import React from 'react';
 import { Header, FixedSessionsButton } from './Header';
 import { Sidebar } from './Sidebar';
-import { SettingsDialog } from './SettingsDialog';
 import { ErrorBoundary } from '../ui/ErrorBoundary';
 import { CommandPalette } from '../ui/CommandPalette';
 import { HelpDialog } from '../ui/HelpDialog';
@@ -16,7 +15,7 @@ import { useDeviceInfo } from '@/lib/device';
 import { useEdgeSwipe } from '@/hooks/useEdgeSwipe';
 import { cn } from '@/lib/utils';
 
-import { ChatView, GitView, DiffView, TerminalView } from '@/components/views';
+import { ChatView, GitView, DiffView, TerminalView, SettingsView } from '@/components/views';
 
 export const MainLayout: React.FC = () => {
     const {
@@ -218,6 +217,7 @@ export const MainLayout: React.FC = () => {
     }, [activeMainTab]);
 
     const isChatActive = activeMainTab === 'chat';
+    const isSettingsActive = isSettingsDialogOpen && !isMobile;
 
     return (
         <DiffWorkerProvider>
@@ -231,13 +231,16 @@ export const MainLayout: React.FC = () => {
                 <CommandPalette />
                 <HelpDialog />
                 <SessionDialogs />
-                <SettingsDialog isOpen={isSettingsDialogOpen} onClose={() => setSettingsDialogOpen(false)} />
 
                 {isMobile ? (
                 <>
-                    <Header />
+                    {/* Mobile: Header + content + settings overlay */}
+                    {!isSettingsDialogOpen && <Header />}
                     <div
-                        className="flex flex-1 overflow-hidden bg-background"
+                        className={cn(
+                            'flex flex-1 overflow-hidden bg-background',
+                            isSettingsDialogOpen && 'hidden'
+                        )}
                         style={{ paddingTop: 'var(--oc-header-height, 56px)' }}
                     >
                         <main className="flex-1 overflow-hidden bg-background relative">
@@ -259,33 +262,53 @@ export const MainLayout: React.FC = () => {
                     >
                         <SessionSidebar mobileVariant />
                     </MobileOverlayPanel>
+
+                    {/* Mobile settings: full screen */}
+                    {isSettingsDialogOpen && (
+                        <div className="absolute inset-0 z-10 bg-background">
+                            <ErrorBoundary><SettingsView onClose={() => setSettingsDialogOpen(false)} /></ErrorBoundary>
+                        </div>
+                    )}
                 </>
             ) : (
                 <>
-                    <Sidebar isOpen={isSidebarOpen} isMobile={isMobile}>
-                        <SessionSidebar />
-                    </Sidebar>
+                    {!isSettingsActive && (
+                        <Sidebar isOpen={isSidebarOpen} isMobile={isMobile}>
+                            <SessionSidebar />
+                        </Sidebar>
+                    )}
 
-                    <div className="flex flex-1 flex-col overflow-hidden">
-                        <Header />
-
-                        <div className="flex flex-1 overflow-hidden bg-background">
-                            <main className="flex-1 overflow-hidden bg-background relative">
-                                <div className={cn('absolute inset-0', !isChatActive && 'invisible')}>
-                                    <ErrorBoundary><ChatView /></ErrorBoundary>
-                                </div>
-                                {secondaryView && (
-                                    <div className="absolute inset-0">
-                                        <ErrorBoundary>{secondaryView}</ErrorBoundary>
+                    {/* Main content area */}
+                    <div className="flex flex-1 flex-col overflow-hidden relative">
+                        {/* Normal view: Header + content */}
+                        <div className={cn('absolute inset-0 flex flex-col', isSettingsActive && 'invisible')}>
+                            <Header />
+                            <div className="flex flex-1 overflow-hidden bg-background">
+                                <main className="flex-1 overflow-hidden bg-background relative">
+                                    <div className={cn('absolute inset-0', !isChatActive && 'invisible')}>
+                                        <ErrorBoundary><ChatView /></ErrorBoundary>
                                     </div>
-                                )}
-                            </main>
+                                    {secondaryView && (
+                                        <div className="absolute inset-0">
+                                            <ErrorBoundary>{secondaryView}</ErrorBoundary>
+                                        </div>
+                                    )}
+                                </main>
+                            </div>
                         </div>
                     </div>
+
+                    {/* Settings view: full screen overlay */}
+                    {isSettingsActive && (
+                        <div className={cn('absolute inset-0 z-10', isDesktopRuntime ? 'bg-transparent' : 'bg-background')}>
+                            <ErrorBoundary><SettingsView onClose={() => setSettingsDialogOpen(false)} /></ErrorBoundary>
+                        </div>
+                    )}
                 </>
             )}
 
-            <FixedSessionsButton />
+            {/* Hide fixed sessions button when settings is open */}
+            {!isSettingsActive && <FixedSessionsButton />}
         </div>
     </DiffWorkerProvider>
     );

packages/ui/src/components/layout/SettingsDialog.tsx

@@ -1,11 +1,4 @@
 import React from 'react';
-import {
-  Dialog,
-  DialogContent,
-  DialogDescription,
-  DialogHeader,
-  DialogTitle,
-} from '@/components/ui/dialog';
 import { cn } from '@/lib/utils';
 import { SIDEBAR_SECTIONS } from '@/constants/sidebar';
 import type { SidebarSection } from '@/constants/sidebar';
@@ -19,10 +12,8 @@ import { ProvidersSidebar } from '@/components/sections/providers/ProvidersSideb
 import { ProvidersPage } from '@/components/sections/providers/ProvidersPage';
 import { GitIdentitiesSidebar } from '@/components/sections/git-identities/GitIdentitiesSidebar';
 import { GitIdentitiesPage } from '@/components/sections/git-identities/GitIdentitiesPage';
-import { SettingsPage } from '@/components/sections/settings/SettingsPage';
-import { useDeviceInfo } from '@/lib/device';
+import { OpenChamberPage } from '@/components/sections/openchamber/OpenChamberPage';
 import { ErrorBoundary } from '@/components/ui/ErrorBoundary';
-import { SIDEBAR_CONTENT_WIDTH } from '@/components/layout/Sidebar';
 import { MobileOverlayPanel } from '@/components/ui/MobileOverlayPanel';
 
 interface SettingsDialogProps {
@@ -37,10 +28,13 @@ const SETTINGS_SECTIONS = (() => {
   return settingsSection ? [settingsSection, ...otherSections] : filtered;
 })();
 
+/**
+ * Mobile-only settings dialog using MobileOverlayPanel.
+ * Desktop uses SettingsView rendered inline in MainLayout.
+ */
 export const SettingsDialog: React.FC<SettingsDialogProps> = ({ isOpen, onClose }) => {
   const [activeTab, setActiveTab] = React.useState<SidebarSection>('settings');
   const [showPageContent, setShowPageContent] = React.useState(false);
-  const { isMobile } = useDeviceInfo();
 
   React.useEffect(() => {
     if (isOpen) {
@@ -51,19 +45,14 @@ export const SettingsDialog: React.FC<SettingsDialogProps> = ({ isOpen, onClose
 
   const handleTabChange = React.useCallback((tab: SidebarSection) => {
     setActiveTab(tab);
-    if (isMobile) {
-      setShowPageContent(false);
-    }
-  }, [isMobile]);
+    setShowPageContent(false);
+  }, []);
 
   const handleItemSelect = React.useCallback(() => {
-    if (isMobile) {
-      setShowPageContent(true);
-    }
-  }, [isMobile]);
+    setShowPageContent(true);
+  }, []);
 
   const renderSidebarContent = () => {
-
     if (activeTab === 'settings') {
       return null;
     }
@@ -73,21 +62,17 @@ export const SettingsDialog: React.FC<SettingsDialogProps> = ({ isOpen, onClose
         case 'agents':
           return <AgentsSidebar />;
         case 'commands':
-      return <CommandsSidebar />;
-    case 'providers':
-      return <ProvidersSidebar />;
-    case 'git-identities':
-      return <GitIdentitiesSidebar />;
-    default:
-      return null;
-  }
+          return <CommandsSidebar />;
+        case 'providers':
+          return <ProvidersSidebar />;
+        case 'git-identities':
+          return <GitIdentitiesSidebar />;
+        default:
+          return null;
+      }
     })();
 
-    if (isMobile) {
-      return <div onClick={handleItemSelect}>{content}</div>;
-    }
-
-    return content;
+    return <div onClick={handleItemSelect}>{content}</div>;
   };
 
   const renderPageContent = () => {
@@ -97,50 +82,19 @@ export const SettingsDialog: React.FC<SettingsDialogProps> = ({ isOpen, onClose
       case 'commands':
         return <CommandsPage />;
       case 'providers':
-      return <ProvidersPage />;
-    case 'git-identities':
-      return <GitIdentitiesPage />;
-    case 'settings':
-      return <SettingsPage />;
+        return <ProvidersPage />;
+      case 'git-identities':
+        return <GitIdentitiesPage />;
+      case 'settings':
+        return <OpenChamberPage />;
       default:
         return null;
     }
   };
 
-  const activeSection = SETTINGS_SECTIONS.find(s => s.id === activeTab);
-  const useMobileOverlay = isMobile;
-
-  const headerContent = (
-    <DialogHeader
-      className="border-b border-border/40 px-6 pb-4 pt-[calc(var(--oc-safe-area-top,0px)+0.5rem)]"
-    >
-      <div className="relative flex items-center justify-center">
-        {isMobile && showPageContent && (
-          <Button
-            variant="ghost"
-            size="icon"
-            onClick={() => setShowPageContent(false)}
-            className="absolute left-0 h-6 w-6 flex-shrink-0"
-          >
-            <RiArrowLeftSLine className="h-5 w-5" />
-            <span className="sr-only">Back to sidebar</span>
-          </Button>
-        )}
-        <DialogTitle className="typography-ui-header">Settings</DialogTitle>
-      </div>
-      {activeSection && (
-        <DialogDescription className="typography-meta text-muted-foreground hidden sm:block">
-          {activeSection.description}
-        </DialogDescription>
-      )}
-    </DialogHeader>
-  );
-
   const mainContent = (
-    <div className={cn(
-      'flex flex-col min-h-0',
-      isMobile ? 'h-full overflow-hidden' : 'flex-1 overflow-hidden'
-    )}>
+    <div className="flex flex-col h-full overflow-hidden">
+      {/* Tab bar */}
       <div className="flex flex-wrap items-center gap-1 border-b border-border/40 bg-background/95 px-3 py-1.5">
         {SETTINGS_SECTIONS.map(({ id, label, icon: Icon }) => {
           const isActive = activeTab === id;
@@ -157,35 +111,22 @@ export const SettingsDialog: React.FC<SettingsDialogProps> = ({ isOpen, onClose
               aria-pressed={isActive}
               aria-label={label}
             >
-              <PhosphorIcon className={cn('h-5 w-5 sm:h-4 sm:w-4')} weight="regular" />
-              <span className="hidden sm:inline">{label}</span>
+              <PhosphorIcon className="h-5 w-5" weight="regular" />
             </button>
           );
         })}
       </div>
 
+      {/* Content area - mobile drill-down pattern */}
       <div className="flex flex-1 overflow-hidden">
-        {activeTab !== 'settings' && (!isMobile || !showPageContent) && (
-          <div
-            className={cn(
-              'overflow-hidden border-r bg-sidebar',
-              isMobile && 'w-full border-r-0'
-            )}
-            style={
-              !isMobile
-                ? {
-                    width: `${SIDEBAR_CONTENT_WIDTH}px`,
-                    minWidth: `${SIDEBAR_CONTENT_WIDTH}px`,
-                  }
-                : undefined
-            }
-          >
+        {activeTab !== 'settings' && !showPageContent && (
+          <div className="w-full overflow-hidden bg-sidebar">
             <ErrorBoundary>{renderSidebarContent()}</ErrorBoundary>
           </div>
         )}
 
-        {(activeTab === 'settings' || !isMobile || showPageContent) && (
-          <div className={cn('flex-1 overflow-hidden bg-background', isMobile && 'w-full')}>
+        {(activeTab === 'settings' || showPageContent) && (
+          <div className="w-full flex-1 overflow-hidden bg-background">
             <ErrorBoundary>{renderPageContent()}</ErrorBoundary>
           </div>
         )}
@@ -193,56 +134,34 @@ export const SettingsDialog: React.FC<SettingsDialogProps> = ({ isOpen, onClose
     </div>
   );
 
-  const panelContent = (
-    <div className="flex h-full flex-col overflow-hidden">
-      {!useMobileOverlay && headerContent}
-      {mainContent}
-    </div>
-  );
-
-  if (useMobileOverlay) {
-    return (
-      <MobileOverlayPanel
-        open={isOpen}
-        onClose={onClose}
-        title="Settings"
-        className="max-w-full"
-        contentMaxHeightClassName="h-[min(80dvh,720px)]"
-        renderHeader={(closeButton) => (
-          <div className="flex items-center justify-between px-3 py-2 border-b border-border/40">
-            <div className="relative flex flex-1 items-center justify-center">
-              {showPageContent && (
-                <Button
-                  variant="ghost"
-                  size="icon"
-                  onClick={() => setShowPageContent(false)}
-                  className="absolute left-0 h-6 w-6 flex-shrink-0"
-                >
-                  <RiArrowLeftSLine className="h-5 w-5" />
-                  <span className="sr-only">Back to sidebar</span>
-                </Button>
-              )}
-              <span className="typography-ui-header">Settings</span>
-            </div>
-            {closeButton}
-          </div>
-        )}
-      >
-        {mainContent}
-      </MobileOverlayPanel>
-    );
-  }
-
   return (
-    <Dialog open={isOpen} onOpenChange={(open) => !open && onClose()}>
-      <DialogContent
-        className={cn(
-          'flex flex-col gap-0 p-0',
-          'h-[88vh] w-[65vw] max-w-[900px]'
-        )}
-      >
-        {panelContent}
-      </DialogContent>
-    </Dialog>
+    <MobileOverlayPanel
+      open={isOpen}
+      onClose={onClose}
+      title="Settings"
+      className="max-w-full"
+      contentMaxHeightClassName="h-[min(80dvh,720px)]"
+      renderHeader={(closeButton) => (
+        <div className="flex items-center justify-between px-3 py-2 border-b border-border/40">
+          <div className="relative flex flex-1 items-center justify-center">
+            {showPageContent && (
+              <Button
+                variant="ghost"
+                size="icon"
+                onClick={() => setShowPageContent(false)}
+                className="absolute left-0 h-6 w-6 flex-shrink-0"
+              >
+                <RiArrowLeftSLine className="h-5 w-5" />
+                <span className="sr-only">Back to sidebar</span>
+              </Button>
+            )}
+            <span className="typography-ui-header">Settings</span>
+          </div>
+          {closeButton}
+        </div>
+      )}
+    >
+      {mainContent}
+    </MobileOverlayPanel>
   );
 };

packages/ui/src/components/layout/VSCodeLayout.tsx

@@ -6,7 +6,7 @@ import { useSessionStore } from '@/stores/useSessionStore';
 import { useConfigStore } from '@/stores/useConfigStore';
 import { ContextUsageDisplay } from '@/components/ui/ContextUsageDisplay';
 import { RiAddLine, RiArrowLeftLine, RiSettings3Line } from '@remixicon/react';
-import { SettingsPage } from '@/components/sections/settings/SettingsPage';
+import { OpenChamberPage } from '@/components/sections/openchamber/OpenChamberPage';
 
 type VSCodeView = 'sessions' | 'chat' | 'settings';
 
@@ -229,7 +229,7 @@ const VSCodeSettingsView: React.FC = () => {
     <div className="flex flex-col h-full">
       {/* Content */}
       <div className="flex-1 overflow-y-auto p-4">
-        <SettingsPage />
+        <OpenChamberPage />
       </div>
     </div>
   );

packages/ui/src/components/sections/agents/AgentsSidebar.tsx

@@ -26,7 +26,11 @@ import { cn } from '@/lib/utils';
 import type { Agent } from '@opencode-ai/sdk';
 import { ScrollableOverlay } from '@/components/ui/ScrollableOverlay';
 
-export const AgentsSidebar: React.FC = () => {
+interface AgentsSidebarProps {
+    onItemSelect?: () => void;
+}
+
+export const AgentsSidebar: React.FC<AgentsSidebarProps> = ({ onItemSelect }) => {
     const [newAgentName, setNewAgentName] = React.useState('');
     const [isCreateDialogOpen, setIsCreateDialogOpen] = React.useState(false);
 
@@ -41,6 +45,16 @@ export const AgentsSidebar: React.FC = () => {
     const { setSidebarOpen } = useUIStore();
     const { isMobile } = useDeviceInfo();
 
+    const [isDesktopRuntime, setIsDesktopRuntime] = React.useState<boolean>(() => {
+        if (typeof window === 'undefined') return false;
+        return typeof window.opencodeDesktop !== 'undefined';
+    });
+
+    React.useEffect(() => {
+        if (typeof window === 'undefined') return;
+        setIsDesktopRuntime(typeof window.opencodeDesktop !== 'undefined');
+    }, []);
+
     React.useEffect(() => {
         loadAgents();
     }, [loadAgents]);
@@ -118,19 +132,16 @@ export const AgentsSidebar: React.FC = () => {
     const customAgents = visibleAgents.filter((agent) => !isAgentBuiltIn(agent));
 
     return (
-        <div className="flex h-full flex-col bg-sidebar">
+        <div className={cn('flex h-full flex-col', isDesktopRuntime ? 'bg-transparent' : 'bg-sidebar')}>
             <Dialog open={isCreateDialogOpen} onOpenChange={setIsCreateDialogOpen}>
                 <div className={cn('border-b border-border/40 px-3 dark:border-white/10', isMobile ? 'mt-2 py-3' : 'py-3')}>
                     <div className="flex items-center justify-between gap-2">
-                        <h2 className="typography-ui-label font-semibold text-foreground">Agents</h2>
-                        <div className="flex items-center gap-1">
-                            <span className="typography-meta text-muted-foreground">{visibleAgents.length}</span>
-                            <DialogTrigger asChild>
-                                <Button type="button" variant="ghost" size="icon" className="h-7 w-7 text-muted-foreground">
-                                    <RiAddLine className="size-4" />
-                                </Button>
-                            </DialogTrigger>
-                        </div>
+                        <span className="typography-meta text-muted-foreground">Total {visibleAgents.length}</span>
+                        <DialogTrigger asChild>
+                            <Button type="button" variant="ghost" size="icon" className="h-7 w-7 -my-1 text-muted-foreground">
+                                <RiAddLine className="size-4" />
+                            </Button>
+                        </DialogTrigger>
                     </div>
                 </div>
 
@@ -155,6 +166,7 @@ export const AgentsSidebar: React.FC = () => {
                                             isSelected={selectedAgentName === agent.name}
                                             onSelect={() => {
                                                 setSelectedAgent(agent.name);
+                                                onItemSelect?.();
                                                 if (isMobile) {
                                                     setSidebarOpen(false);
                                                 }
@@ -178,6 +190,7 @@ export const AgentsSidebar: React.FC = () => {
                                             isSelected={selectedAgentName === agent.name}
                                             onSelect={() => {
                                                 setSelectedAgent(agent.name);
+                                                onItemSelect?.();
                                                 if (isMobile) {
                                                     setSidebarOpen(false);
                                                 }
@@ -247,38 +260,33 @@ const AgentListItem: React.FC<AgentListItemProps> = ({
     getAgentModeIcon,
 }) => {
     return (
-        <div className="group transition-all duration-200">
-            <div className="relative">
-                <div className="w-full flex items-center justify-between py-1.5 px-2 pr-1">
-                    <button
-                        onClick={onSelect}
-                        className="flex-1 text-left overflow-hidden"
-                        inputMode="none"
-                        tabIndex={0}
-                    >
-                        <div className="flex items-center gap-1.5">
-                            <div className={cn(
-                                "typography-ui-label font-medium truncate",
-                                isSelected
-                                    ? "text-primary"
-                                    : "text-foreground hover:text-primary/80"
-                            )}>
-                                {agent.name}
-                            </div>
+        <div
+            className={cn(
+                'group relative flex items-center rounded-md px-1.5 py-1 transition-all duration-200',
+                isSelected ? 'dark:bg-accent/80 bg-primary/12' : 'hover:dark:bg-accent/40 hover:bg-primary/6'
+            )}
+        >
+            <div className="flex min-w-0 flex-1 items-center">
+                <button
+                    onClick={onSelect}
+                    className="flex min-w-0 flex-1 flex-col gap-0 rounded-sm text-left focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary/50"
+                    tabIndex={0}
+                >
+                    <div className="flex items-center gap-1.5">
+                        <span className="typography-ui-label font-normal truncate text-foreground">
+                            {agent.name}
+                        </span>
+                        {getAgentModeIcon(agent.mode)}
+                    </div>
 
-                            {}
-                            {getAgentModeIcon(agent.mode)}
+                    {agent.description && (
+                        <div className="typography-micro text-muted-foreground/60 truncate leading-tight">
+                            {agent.description}
                         </div>
+                    )}
+                </button>
 
-                        {}
-                        {agent.description && (
-                            <div className="typography-meta text-muted-foreground truncate mt-0.5">
-                                {agent.description}
-                            </div>
-                        )}
-                    </button>
-
-                    <DropdownMenu>
+                <DropdownMenu>
                         <DropdownMenuTrigger asChild>
                             <Button
                                 size="icon"
@@ -313,7 +321,6 @@ const AgentListItem: React.FC<AgentListItemProps> = ({
                             )}
                         </DropdownMenuContent>
                     </DropdownMenu>
-                </div>
             </div>
         </div>
     );

packages/ui/src/components/sections/commands/CommandsSidebar.tsx

@@ -25,7 +25,11 @@ import { useDeviceInfo } from '@/lib/device';
 import { ScrollableOverlay } from '@/components/ui/ScrollableOverlay';
 import { cn } from '@/lib/utils';
 
-export const CommandsSidebar: React.FC = () => {
+interface CommandsSidebarProps {
+  onItemSelect?: () => void;
+}
+
+export const CommandsSidebar: React.FC<CommandsSidebarProps> = ({ onItemSelect }) => {
   const [newCommandName, setNewCommandName] = React.useState('');
   const [isCreateDialogOpen, setIsCreateDialogOpen] = React.useState(false);
 
@@ -40,6 +44,16 @@ export const CommandsSidebar: React.FC = () => {
   const { setSidebarOpen } = useUIStore();
   const { isMobile } = useDeviceInfo();
 
+  const [isDesktopRuntime, setIsDesktopRuntime] = React.useState<boolean>(() => {
+    if (typeof window === 'undefined') return false;
+    return typeof window.opencodeDesktop !== 'undefined';
+  });
+
+  React.useEffect(() => {
+    if (typeof window === 'undefined') return;
+    setIsDesktopRuntime(typeof window.opencodeDesktop !== 'undefined');
+  }, []);
+
   React.useEffect(() => {
     loadCommands();
   }, [loadCommands]);
@@ -96,19 +110,16 @@ export const CommandsSidebar: React.FC = () => {
   };
 
   return (
-    <div className="flex h-full flex-col bg-sidebar">
+    <div className={cn('flex h-full flex-col', isDesktopRuntime ? 'bg-transparent' : 'bg-sidebar')}>
       <Dialog open={isCreateDialogOpen} onOpenChange={setIsCreateDialogOpen}>
         <div className={cn('border-b border-border/40 px-3 dark:border-white/10', isMobile ? 'mt-2 py-3' : 'py-3')}>
           <div className="flex items-center justify-between gap-2">
-            <h2 className="typography-ui-label font-semibold text-foreground">Commands</h2>
-            <div className="flex items-center gap-1">
-              <span className="typography-meta text-muted-foreground">{commands.length}</span>
-              <DialogTrigger asChild>
-                <Button type="button" variant="ghost" size="icon" className="h-7 w-7 text-muted-foreground">
-                  <RiAddLine className="size-4" />
-                </Button>
-              </DialogTrigger>
-            </div>
+            <span className="typography-meta text-muted-foreground">Total {commands.length}</span>
+            <DialogTrigger asChild>
+              <Button type="button" variant="ghost" size="icon" className="h-7 w-7 -my-1 text-muted-foreground">
+                <RiAddLine className="size-4" />
+              </Button>
+            </DialogTrigger>
           </div>
         </div>
 
@@ -121,21 +132,22 @@ export const CommandsSidebar: React.FC = () => {
               </div>
             ) : (
               <>
-                {[...commands].sort((a, b) => a.name.localeCompare(b.name)).map((command) => (
-                  <CommandListItem
-                    key={command.name}
-                    command={command}
-                    isSelected={selectedCommandName === command.name}
-                    onSelect={() => {
-                      setSelectedCommand(command.name);
-                      if (isMobile) {
-                        setSidebarOpen(false);
-                      }
-                    }}
-                    onDelete={() => handleDeleteCommand(command)}
-                    onDuplicate={() => handleDuplicateCommand(command)}
-                  />
-                ))}
+                  {[...commands].sort((a, b) => a.name.localeCompare(b.name)).map((command) => (
+                    <CommandListItem
+                      key={command.name}
+                      command={command}
+                      isSelected={selectedCommandName === command.name}
+                      onSelect={() => {
+                        setSelectedCommand(command.name);
+                        onItemSelect?.();
+                        if (isMobile) {
+                          setSidebarOpen(false);
+                        }
+                      }}
+                      onDelete={() => handleDeleteCommand(command)}
+                      onDuplicate={() => handleDuplicateCommand(command)}
+                    />
+                  ))}
               </>
             )}
         </ScrollableOverlay>
@@ -192,68 +204,64 @@ const CommandListItem: React.FC<CommandListItemProps> = ({
   onDuplicate,
 }) => {
   return (
-    <div className="group transition-all duration-200">
-      <div className="relative">
-        <div className="w-full flex items-center justify-between py-1.5 px-2 pr-1">
-          <button
-            onClick={onSelect}
-            className="flex-1 text-left overflow-hidden"
-            inputMode="none"
-            tabIndex={0}
-          >
-            <div className="flex items-center gap-2">
-              <div className={cn(
-                "typography-ui-label font-medium truncate flex-1",
-                isSelected
-                  ? "text-primary"
-                  : "text-foreground hover:text-primary/80"
-              )}>
-                /{command.name}
-              </div>
+    <div
+      className={cn(
+        'group relative flex items-center rounded-md px-1.5 py-1 transition-all duration-200',
+        isSelected ? 'dark:bg-accent/80 bg-primary/12' : 'hover:dark:bg-accent/40 hover:bg-primary/6'
+      )}
+    >
+      <div className="flex min-w-0 flex-1 items-center">
+        <button
+          onClick={onSelect}
+          className="flex min-w-0 flex-1 flex-col gap-0 rounded-sm text-left focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary/50"
+          tabIndex={0}
+        >
+          <div className="flex items-center gap-2">
+            <span className="typography-ui-label font-normal truncate text-foreground">
+              /{command.name}
+            </span>
+          </div>
+
+          {command.description && (
+            <div className="typography-micro text-muted-foreground/60 truncate leading-tight">
+              {command.description}
             </div>
+          )}
+        </button>
 
-            {}
-            {command.description && (
-              <div className="typography-meta text-muted-foreground truncate mt-0.5">
-                {command.description}
-              </div>
-            )}
-          </button>
+        <DropdownMenu>
+          <DropdownMenuTrigger asChild>
+            <Button
+              size="icon"
+              variant="ghost"
+              className="h-6 w-6 flex-shrink-0 -mr-1 opacity-100 transition-opacity md:opacity-0 md:group-hover:opacity-100"
+            >
+              <RiMore2Line className="h-3.5 w-3.5" />
+            </Button>
+          </DropdownMenuTrigger>
+          <DropdownMenuContent align="end" className="w-fit min-w-20">
+            <DropdownMenuItem
+              onClick={(e) => {
+                e.stopPropagation();
+                onDuplicate();
+              }}
+            >
+              <RiFileCopyLine className="h-4 w-4 mr-px" />
+              Duplicate
+            </DropdownMenuItem>
 
-          <DropdownMenu>
-            <DropdownMenuTrigger asChild>
-              <Button
-                size="icon"
-                variant="ghost"
-                className="h-6 w-6 flex-shrink-0 -mr-1 opacity-100 transition-opacity md:opacity-0 md:group-hover:opacity-100"
-              >
-                <RiMore2Line className="h-3.5 w-3.5" />
-              </Button>
-            </DropdownMenuTrigger>
-            <DropdownMenuContent align="end" className="w-fit min-w-20">
-              <DropdownMenuItem
-                onClick={(e) => {
-                  e.stopPropagation();
-                  onDuplicate();
-                }}
-              >
-                <RiFileCopyLine className="h-4 w-4 mr-px" />
-                Duplicate
-              </DropdownMenuItem>
-
-              <DropdownMenuItem
-                onClick={(e) => {
-                  e.stopPropagation();
-                  onDelete();
-                }}
-                className="text-destructive focus:text-destructive"
-              >
-                <RiDeleteBinLine className="h-4 w-4 mr-px" />
-                Delete
-              </DropdownMenuItem>
-            </DropdownMenuContent>
-          </DropdownMenu>
-        </div>
+            <DropdownMenuItem
+              onClick={(e) => {
+                e.stopPropagation();
+                onDelete();
+              }}
+              className="text-destructive focus:text-destructive"
+            >
+              <RiDeleteBinLine className="h-4 w-4 mr-px" />
+              Delete
+            </DropdownMenuItem>
+          </DropdownMenuContent>
+        </DropdownMenu>
       </div>
     </div>
   );

packages/ui/src/components/sections/git-identities/GitIdentitiesSidebar.tsx

@@ -42,7 +42,11 @@ const COLOR_MAP: Record<string, string> = {
   type: 'var(--syntax-type)',
 };
 
-export const GitIdentitiesSidebar: React.FC = () => {
+interface GitIdentitiesSidebarProps {
+  onItemSelect?: () => void;
+}
+
+export const GitIdentitiesSidebar: React.FC<GitIdentitiesSidebarProps> = ({ onItemSelect }) => {
   const {
     selectedProfileId,
     profiles,
@@ -56,6 +60,16 @@ export const GitIdentitiesSidebar: React.FC = () => {
   const { setSidebarOpen } = useUIStore();
   const { isMobile } = useDeviceInfo();
 
+  const [isDesktopRuntime, setIsDesktopRuntime] = React.useState<boolean>(() => {
+    if (typeof window === 'undefined') return false;
+    return typeof window.opencodeDesktop !== 'undefined';
+  });
+
+  React.useEffect(() => {
+    if (typeof window === 'undefined') return;
+    setIsDesktopRuntime(typeof window.opencodeDesktop !== 'undefined');
+  }, []);
+
   React.useEffect(() => {
     loadProfiles();
     loadGlobalIdentity();
@@ -63,6 +77,7 @@ export const GitIdentitiesSidebar: React.FC = () => {
 
   const handleCreateProfile = () => {
     setSelectedProfile('new');
+    onItemSelect?.();
     if (isMobile) {
       setSidebarOpen(false);
     }
@@ -80,22 +95,19 @@ export const GitIdentitiesSidebar: React.FC = () => {
   };
 
   return (
-    <div className="flex h-full flex-col bg-sidebar">
+    <div className={cn('flex h-full flex-col', isDesktopRuntime ? 'bg-transparent' : 'bg-sidebar')}>
       <div className={cn('border-b border-border/40 px-3 dark:border-white/10', isMobile ? 'mt-2 py-3' : 'py-3')}>
         <div className="flex items-center justify-between gap-2">
-          <h2 className="typography-ui-label font-semibold text-foreground">Git Profiles</h2>
-          <div className="flex items-center gap-1">
-            <span className="typography-meta text-muted-foreground">{profiles.length}</span>
-            <Button
-              type="button"
-              variant="ghost"
-              size="icon"
-              className="h-7 w-7 text-muted-foreground"
-              onClick={handleCreateProfile}
-            >
-              <RiAddLine className="size-4" />
-            </Button>
-          </div>
+          <span className="typography-meta text-muted-foreground">Total {profiles.length}</span>
+          <Button
+            type="button"
+            variant="ghost"
+            size="icon"
+            className="h-7 w-7 -my-1 text-muted-foreground"
+            onClick={handleCreateProfile}
+          >
+            <RiAddLine className="size-4" />
+          </Button>
         </div>
       </div>
 
@@ -111,6 +123,7 @@ export const GitIdentitiesSidebar: React.FC = () => {
                 isSelected={selectedProfileId === 'global'}
                 onSelect={() => {
                   setSelectedProfile('global');
+                  onItemSelect?.();
                   if (isMobile) {
                     setSidebarOpen(false);
                   }
@@ -143,6 +156,7 @@ export const GitIdentitiesSidebar: React.FC = () => {
                   isSelected={selectedProfileId === profile.id}
                   onSelect={() => {
                     setSelectedProfile(profile.id);
+                    onItemSelect?.();
                     if (isMobile) {
                       setSidebarOpen(false);
                     }
@@ -172,68 +186,62 @@ const ProfileListItem: React.FC<ProfileListItemProps> = ({
   onDelete,
   isReadOnly = false,
 }) => {
-
   const IconComponent = ICON_MAP[profile.icon || 'branch'] || RiGitBranchLine;
-
   const iconColor = COLOR_MAP[profile.color || ''];
 
   return (
-    <div className="group transition-all duration-200">
-      <div className="relative">
-        <div className="w-full flex items-center justify-between py-1.5 px-2 pr-1">
-          <button
-            onClick={onSelect}
-            className="flex-1 text-left overflow-hidden"
-            inputMode="none"
-            tabIndex={0}
-          >
-             <div className="flex items-center gap-2">
-               <IconComponent
-                 className="w-4 h-4 flex-shrink-0"
-                 style={{ color: iconColor }}
-               />
-              <div className={cn(
-                "typography-ui-label font-medium truncate flex-1",
-                isSelected
-                  ? "text-primary"
-                  : "text-foreground hover:text-primary/80"
-              )}>
-                {profile.name}
-              </div>
-            </div>
+    <div
+      className={cn(
+        'group relative flex items-center rounded-md px-1.5 py-1 transition-all duration-200',
+        isSelected ? 'dark:bg-accent/80 bg-primary/12' : 'hover:dark:bg-accent/40 hover:bg-primary/6'
+      )}
+    >
+      <div className="flex min-w-0 flex-1 items-center">
+        <button
+          onClick={onSelect}
+          className="flex min-w-0 flex-1 flex-col gap-0 rounded-sm text-left focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary/50"
+          tabIndex={0}
+        >
+          <div className="flex items-center gap-2">
+            <IconComponent
+              className="w-4 h-4 flex-shrink-0"
+              style={{ color: iconColor }}
+            />
+            <span className="typography-ui-label font-normal truncate flex-1 text-foreground">
+              {profile.name}
+            </span>
+          </div>
 
-            {}
-            <div className="typography-meta text-muted-foreground truncate mt-0.5">
-              {profile.userEmail}
-            </div>
-          </button>
+          <div className="typography-micro text-muted-foreground/60 truncate leading-tight">
+            {profile.userEmail}
+          </div>
+        </button>
 
-          {!isReadOnly && onDelete && (
-            <DropdownMenu>
-              <DropdownMenuTrigger asChild>
-                 <Button
-                   size="icon"
-                   variant="ghost"
-                   className="h-6 w-6 flex-shrink-0 -mr-1 opacity-100 transition-opacity md:opacity-0 md:group-hover:opacity-100"
-                 >
-                   <RiMore2Line className="h-3.5 w-3.5" />
-                 </Button>
-              </DropdownMenuTrigger>
-              <DropdownMenuContent align="end" className="w-fit min-w-20">
-                 <DropdownMenuItem
-                   onClick={(e) => {
-                     e.stopPropagation();
-                     onDelete();
-                   }}
-                   className="text-destructive focus:text-destructive"
-                 >
-                   <RiDeleteBinLine className="h-4 w-4 mr-px" />
-                   Delete
-                 </DropdownMenuItem>
-              </DropdownMenuContent>
-            </DropdownMenu>
-          )}
-        </div>
+        {!isReadOnly && onDelete && (
+          <DropdownMenu>
+            <DropdownMenuTrigger asChild>
+              <Button
+                size="icon"
+                variant="ghost"
+                className="h-6 w-6 flex-shrink-0 -mr-1 opacity-100 transition-opacity md:opacity-0 md:group-hover:opacity-100"
+              >
+                <RiMore2Line className="h-3.5 w-3.5" />
+              </Button>
+            </DropdownMenuTrigger>
+            <DropdownMenuContent align="end" className="w-fit min-w-20">
+              <DropdownMenuItem
+                onClick={(e) => {
+                  e.stopPropagation();
+                  onDelete();
+                }}
+                className="text-destructive focus:text-destructive"
+              >
+                <RiDeleteBinLine className="h-4 w-4 mr-px" />
+                Delete
+              </DropdownMenuItem>
+            </DropdownMenuContent>
+          </DropdownMenu>
+        )}
       </div>
     </div>
   );

packages/ui/src/components/sections/openchamber/AboutSettings.tsx

@@ -0,0 +1,237 @@
+import React from 'react';
+import { RiDiscordFill, RiDownloadLine, RiGithubFill, RiLoaderLine, RiTwitterXFill } from '@remixicon/react';
+import { useUpdateStore } from '@/stores/useUpdateStore';
+import { UpdateDialog } from '@/components/ui/UpdateDialog';
+import { useDeviceInfo } from '@/lib/device';
+import { toast } from 'sonner';
+import { cn } from '@/lib/utils';
+
+const GITHUB_URL = 'https://github.com/btriapitsyn/openchamber';
+
+const MIN_CHECKING_DURATION = 800; // ms
+
+export const AboutSettings: React.FC = () => {
+  const [updateDialogOpen, setUpdateDialogOpen] = React.useState(false);
+  const [showChecking, setShowChecking] = React.useState(false);
+  const updateStore = useUpdateStore();
+  const { isMobile } = useDeviceInfo();
+
+  const currentVersion = updateStore.info?.currentVersion || 'unknown';
+
+  // Track if we initiated a check to show toast on completion
+  const didInitiateCheck = React.useRef(false);
+
+  // Ensure minimum visible duration for checking animation
+  React.useEffect(() => {
+    if (updateStore.checking) {
+      setShowChecking(true);
+      didInitiateCheck.current = true;
+    } else if (showChecking) {
+      const timer = setTimeout(() => {
+        setShowChecking(false);
+        // Show toast if check completed with no update available
+        if (didInitiateCheck.current && !updateStore.available && !updateStore.error) {
+          toast.success('You are on the latest version');
+          didInitiateCheck.current = false;
+        }
+      }, MIN_CHECKING_DURATION);
+      return () => clearTimeout(timer);
+    }
+  }, [updateStore.checking, showChecking, updateStore.available, updateStore.error]);
+
+  const isChecking = updateStore.checking || showChecking;
+
+  // Compact mobile layout for sidebar footer
+  if (isMobile) {
+    return (
+      <div className="w-full space-y-2">
+        {/* Version row with update status */}
+        <div className="flex items-center justify-between">
+          <span className="typography-meta text-muted-foreground">
+            v{currentVersion}
+          </span>
+
+          {!updateStore.available && !updateStore.error && (
+            <button
+              onClick={() => updateStore.checkForUpdates()}
+              disabled={isChecking}
+              className={cn(
+                'typography-meta text-muted-foreground/60 hover:text-muted-foreground disabled:cursor-default',
+                isChecking && 'animate-pulse [animation-duration:1s]'
+              )}
+            >
+              Check updates
+            </button>
+          )}
+
+          {!isChecking && updateStore.available && (
+            <button
+              onClick={() => setUpdateDialogOpen(true)}
+              className="flex items-center gap-1 typography-meta text-primary hover:underline"
+            >
+              <RiDownloadLine className="h-3.5 w-3.5" />
+              Update
+            </button>
+          )}
+        </div>
+
+        {updateStore.error && (
+          <p className="typography-micro text-destructive truncate">{updateStore.error}</p>
+        )}
+
+        {/* Links row */}
+        <div className="flex items-center gap-3">
+          <a
+            href={GITHUB_URL}
+            target="_blank"
+            rel="noopener noreferrer"
+            className="flex items-center gap-1 typography-meta text-muted-foreground hover:text-foreground transition-colors"
+          >
+            <RiGithubFill className="h-3.5 w-3.5" />
+            <span>GitHub</span>
+          </a>
+
+          <a
+            href="https://discord.gg/ZYRSdnwwKA"
+            target="_blank"
+            rel="noopener noreferrer"
+            className="flex items-center gap-1 typography-meta text-muted-foreground hover:text-foreground transition-colors"
+          >
+            <RiDiscordFill className="h-3.5 w-3.5" />
+            <span>Discord</span>
+          </a>
+
+          <a
+            href="https://x.com/btriapitsyn"
+            target="_blank"
+            rel="noopener noreferrer"
+            className="flex items-center gap-1 typography-meta text-muted-foreground hover:text-foreground transition-colors"
+          >
+            <RiTwitterXFill className="h-3.5 w-3.5" />
+            <span>@btriapitsyn</span>
+          </a>
+        </div>
+
+        <UpdateDialog
+          open={updateDialogOpen}
+          onOpenChange={setUpdateDialogOpen}
+          info={updateStore.info}
+          downloading={updateStore.downloading}
+          downloaded={updateStore.downloaded}
+          progress={updateStore.progress}
+          error={updateStore.error}
+          onDownload={updateStore.downloadUpdate}
+          onRestart={updateStore.restartToUpdate}
+          runtimeType={updateStore.runtimeType}
+        />
+      </div>
+    );
+  }
+
+  // Desktop layout (unchanged)
+  return (
+    <div className="w-full space-y-6">
+      <div className="space-y-1">
+        <h3 className="typography-ui-header font-semibold text-foreground">
+          About OpenChamber
+        </h3>
+      </div>
+
+      {/* Version and Update */}
+      <div className="space-y-3">
+        <div className="flex items-center justify-between">
+          <div className="space-y-0.5">
+            <div className="typography-ui-label text-muted-foreground">Version</div>
+            <div className="typography-ui-header font-mono">{currentVersion}</div>
+          </div>
+
+          {updateStore.checking && (
+            <div className="flex items-center gap-2 text-muted-foreground">
+              <RiLoaderLine className="h-4 w-4 animate-spin" />
+              <span className="typography-meta">Checking...</span>
+            </div>
+          )}
+
+          {!updateStore.checking && updateStore.available && (
+            <button
+              onClick={() => setUpdateDialogOpen(true)}
+              className={cn(
+                'flex items-center gap-2 px-3 py-1.5 rounded-md',
+                'text-sm font-medium',
+                'bg-primary text-primary-foreground',
+                'hover:bg-primary/90',
+                'transition-colors'
+              )}
+            >
+              <RiDownloadLine className="h-4 w-4" />
+              Update to {updateStore.info?.version}
+            </button>
+          )}
+
+          {!updateStore.checking && !updateStore.available && !updateStore.error && (
+            <span className="typography-meta text-muted-foreground">Up to date</span>
+          )}
+        </div>
+
+        {updateStore.error && (
+          <p className="typography-meta text-destructive">{updateStore.error}</p>
+        )}
+
+        <button
+          onClick={() => updateStore.checkForUpdates()}
+          disabled={updateStore.checking}
+          className={cn(
+            'typography-meta text-muted-foreground hover:text-foreground',
+            'underline-offset-2 hover:underline',
+            'disabled:opacity-50 disabled:cursor-not-allowed'
+          )}
+        >
+          Check for updates
+        </button>
+      </div>
+
+      {/* Links */}
+      <div className="flex items-center gap-4">
+        <a
+          href={GITHUB_URL}
+          target="_blank"
+          rel="noopener noreferrer"
+          className={cn(
+            'flex items-center gap-1.5 text-muted-foreground hover:text-foreground',
+            'typography-meta transition-colors'
+          )}
+        >
+          <RiGithubFill className="h-4 w-4" />
+          <span>GitHub</span>
+        </a>
+
+        <a
+          href="https://x.com/btriapitsyn"
+          target="_blank"
+          rel="noopener noreferrer"
+          className={cn(
+            'flex items-center gap-1.5 text-muted-foreground hover:text-foreground',
+            'typography-meta transition-colors'
+          )}
+        >
+          <RiTwitterXFill className="h-4 w-4" />
+          <span>@btriapitsyn</span>
+        </a>
+      </div>
+
+      {/* Update Dialog */}
+      <UpdateDialog
+        open={updateDialogOpen}
+        onOpenChange={setUpdateDialogOpen}
+        info={updateStore.info}
+        downloading={updateStore.downloading}
+        downloaded={updateStore.downloaded}
+        progress={updateStore.progress}
+        error={updateStore.error}
+        onDownload={updateStore.downloadUpdate}
+        onRestart={updateStore.restartToUpdate}
+        runtimeType={updateStore.runtimeType}
+      />
+    </div>
+  );
+};

packages/ui/src/components/sections/openchamber/OpenChamberPage.tsx

@@ -0,0 +1,87 @@
+import React from 'react';
+import { OpenChamberVisualSettings } from './OpenChamberVisualSettings';
+import { AboutSettings } from './AboutSettings';
+import { SessionRetentionSettings } from './SessionRetentionSettings';
+import { DefaultsSettings } from './DefaultsSettings';
+import { ScrollableOverlay } from '@/components/ui/ScrollableOverlay';
+import { useDeviceInfo } from '@/lib/device';
+import { isWebRuntime } from '@/lib/desktop';
+import type { OpenChamberSection } from './OpenChamberSidebar';
+
+interface OpenChamberPageProps {
+    /** Which section to display. If undefined, shows all sections (mobile/legacy behavior) */
+    section?: OpenChamberSection;
+}
+
+export const OpenChamberPage: React.FC<OpenChamberPageProps> = ({ section }) => {
+    const { isMobile } = useDeviceInfo();
+    const showAbout = isMobile && isWebRuntime();
+
+    // If no section specified, show all (mobile/legacy behavior)
+    if (!section) {
+        return (
+            <ScrollableOverlay
+                outerClassName="h-full"
+                className="openchamber-page-body mx-auto max-w-3xl space-y-3 p-3 sm:space-y-6 sm:p-6"
+            >
+                <OpenChamberVisualSettings />
+                <div className="border-t border-border/40 pt-6">
+                    <DefaultsSettings />
+                </div>
+                <div className="border-t border-border/40 pt-6">
+                    <SessionRetentionSettings />
+                </div>
+                {showAbout && (
+                    <div className="border-t border-border/40 pt-6">
+                        <AboutSettings />
+                    </div>
+                )}
+            </ScrollableOverlay>
+        );
+    }
+
+    // Show specific section content
+    const renderSectionContent = () => {
+        switch (section) {
+            case 'visual':
+                return <VisualSectionContent />;
+            case 'chat':
+                return <ChatSectionContent />;
+            case 'sessions':
+                return <SessionsSectionContent />;
+            default:
+                return null;
+        }
+    };
+
+    return (
+        <ScrollableOverlay
+            outerClassName="h-full"
+            className="openchamber-page-body mx-auto max-w-3xl space-y-6 p-3 sm:p-6"
+        >
+            {renderSectionContent()}
+        </ScrollableOverlay>
+    );
+};
+
+// Visual section: Theme Mode, Font Size, Spacing
+const VisualSectionContent: React.FC = () => {
+    return <OpenChamberVisualSettings visibleSettings={['theme', 'fontSize', 'spacing']} />;
+};
+
+// Chat section: Default Tool Output, Diff layout, Show reasoning traces
+const ChatSectionContent: React.FC = () => {
+    return <OpenChamberVisualSettings visibleSettings={['toolOutput', 'diffLayout', 'reasoning']} />;
+};
+
+// Sessions section: Default model & agent, Session retention
+const SessionsSectionContent: React.FC = () => {
+    return (
+        <div className="space-y-6">
+            <DefaultsSettings />
+            <div className="border-t border-border/40 pt-6">
+                <SessionRetentionSettings />
+            </div>
+        </div>
+    );
+};

packages/ui/src/components/sections/openchamber/OpenChamberSidebar.tsx

@@ -0,0 +1,93 @@
+import React from 'react';
+import { ScrollableOverlay } from '@/components/ui/ScrollableOverlay';
+import { useDeviceInfo } from '@/lib/device';
+import { isWebRuntime } from '@/lib/desktop';
+import { AboutSettings } from './AboutSettings';
+import { cn } from '@/lib/utils';
+
+export type OpenChamberSection = 'visual' | 'chat' | 'sessions';
+
+interface OpenChamberSidebarProps {
+  selectedSection: OpenChamberSection;
+  onSelectSection: (section: OpenChamberSection) => void;
+}
+
+interface SectionGroup {
+  id: OpenChamberSection;
+  label: string;
+  items: string[];
+}
+
+const OPENCHAMBER_SECTION_GROUPS: SectionGroup[] = [
+  {
+    id: 'visual',
+    label: 'Visual',
+    items: ['Theme', 'Font', 'Spacing'],
+  },
+  {
+    id: 'chat',
+    label: 'Chat',
+    items: ['Tools', 'Diff', 'Reasoning'],
+  },
+  {
+    id: 'sessions',
+    label: 'Sessions',
+    items: ['Defaults', 'Retention'],
+  },
+];
+
+export const OpenChamberSidebar: React.FC<OpenChamberSidebarProps> = ({
+  selectedSection,
+  onSelectSection,
+}) => {
+  const { isMobile } = useDeviceInfo();
+  const showAbout = isMobile && isWebRuntime();
+
+  const [isDesktopRuntime, setIsDesktopRuntime] = React.useState<boolean>(() => {
+    if (typeof window === 'undefined') return false;
+    return typeof window.opencodeDesktop !== 'undefined';
+  });
+
+  React.useEffect(() => {
+    if (typeof window === 'undefined') return;
+    setIsDesktopRuntime(typeof window.opencodeDesktop !== 'undefined');
+  }, []);
+
+  return (
+    <div className={cn('flex h-full flex-col', isDesktopRuntime ? 'bg-transparent' : 'bg-sidebar')}>
+      <ScrollableOverlay outerClassName="flex-1 min-h-0" className="space-y-1 px-3 py-2 overflow-x-hidden">
+        {OPENCHAMBER_SECTION_GROUPS.map((group) => {
+          const isSelected = selectedSection === group.id;
+          return (
+            <div
+              key={group.id}
+              className={cn(
+                'group relative rounded-md px-1.5 py-1 transition-all duration-200',
+                isSelected ? 'dark:bg-accent/80 bg-primary/12' : 'hover:dark:bg-accent/40 hover:bg-primary/6'
+              )}
+            >
+              <button
+                onClick={() => onSelectSection(group.id)}
+                className="w-full text-left flex flex-col gap-0 rounded-sm focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary/50"
+              >
+                <span className="typography-ui-label font-normal text-foreground">
+                  {group.label}
+                </span>
+                <div className="typography-micro text-muted-foreground/60 leading-tight">
+                  {group.items.join(' · ')}
+                </div>
+              </button>
+            </div>
+          );
+        })}
+      </ScrollableOverlay>
+
+      {/* Mobile footer: About section */}
+      {showAbout && (
+        <div className="border-t border-border/40 px-3 py-4">
+          <AboutSettings />
+        </div>
+      )}
+    </div>
+  );
+};

packages/ui/src/components/sections/openchamber/OpenChamberVisualSettings.tsx

@@ -55,7 +55,14 @@ const DIFF_LAYOUT_OPTIONS: Option<'dynamic' | 'inline' | 'side-by-side'>[] = [
     },
 ];
 
-export const AppearanceSettings: React.FC = () => {
+export type VisibleSetting = 'theme' | 'fontSize' | 'spacing' | 'toolOutput' | 'diffLayout' | 'reasoning';
+
+interface OpenChamberVisualSettingsProps {
+    /** Which settings to show. If undefined, shows all. */
+    visibleSettings?: VisibleSetting[];
+}
+
+export const OpenChamberVisualSettings: React.FC<OpenChamberVisualSettingsProps> = ({ visibleSettings }) => {
     const { isMobile } = useDeviceInfo();
     const showReasoningTraces = useUIStore(state => state.showReasoningTraces);
     const setShowReasoningTraces = useUIStore(state => state.setShowReasoningTraces);
@@ -72,9 +79,14 @@ export const AppearanceSettings: React.FC = () => {
         setThemeMode,
     } = useThemeSystem();
 
+    const shouldShow = (setting: VisibleSetting): boolean => {
+        if (!visibleSettings) return true;
+        return visibleSettings.includes(setting);
+    };
+
     return (
         <div className="w-full space-y-8">
-            {!isVSCodeRuntime() && (
+            {shouldShow('theme') && !isVSCodeRuntime() && (
                 <div className="space-y-4">
                     <div className="space-y-1">
                         <h3 className="typography-ui-header font-semibold text-foreground">
@@ -97,7 +109,7 @@ export const AppearanceSettings: React.FC = () => {
                 </div>
             )}
 
-            {!isMobile && (
+            {shouldShow('fontSize') && !isMobile && (
                 <div className="space-y-4">
                     <div className="space-y-1">
                         <h3 className="typography-ui-header font-semibold text-foreground">
@@ -138,102 +150,105 @@ export const AppearanceSettings: React.FC = () => {
                 </div>
             )}
 
-            <div className="space-y-4">
-                <div className="space-y-1">
-                    <h3 className="typography-ui-header font-semibold text-foreground">
-                        Spacing
-                    </h3>
+            {shouldShow('spacing') && (
+                <div className="space-y-4">
+                    <div className="space-y-1">
+                        <h3 className="typography-ui-header font-semibold text-foreground">
+                            Spacing
+                        </h3>
 
-                </div>
-
-                {isMobile ? (
-                    <div className="flex items-center gap-2 w-full">
-                        <input
-                            type="range"
-                            min="50"
-                            max="200"
-                            step="5"
-                            value={padding}
-                            onChange={(e) => setPadding(Number(e.target.value))}
-                            className="flex-1 min-w-0 h-3 bg-muted rounded-full appearance-none cursor-pointer [&::-webkit-slider-thumb]:appearance-none [&::-webkit-slider-thumb]:w-5 [&::-webkit-slider-thumb]:h-5 [&::-webkit-slider-thumb]:rounded-full [&::-webkit-slider-thumb]:bg-primary [&::-moz-range-thumb]:w-5 [&::-moz-range-thumb]:h-5 [&::-moz-range-thumb]:rounded-full [&::-moz-range-thumb]:bg-primary [&::-moz-range-thumb]:border-0"
-                            aria-label="Spacing percentage"
-                        />
-
-                        <span className="typography-ui-label font-medium text-foreground tabular-nums rounded-md border border-border bg-background px-2 py-1.5 min-w-[3.75rem] text-center">
-                            {padding}
-                        </span>
-
-                        <ButtonSmall
-                            type="button"
-                            variant="ghost"
-                            onClick={() => setPadding(100)}
-                            disabled={padding === 100}
-                            className="h-8 w-8 px-0 border border-border bg-background hover:bg-accent disabled:opacity-100 disabled:bg-background"
-                            aria-label="Reset spacing"
-                            title="Reset"
-                        >
-                            <RiRestartLine className="h-3.5 w-3.5" />
-                        </ButtonSmall>
                     </div>
-                ) : (
-                    <div className="flex items-center gap-3 w-full max-w-md">
-                        <input
-                            type="range"
-                            min="50"
-                            max="200"
-                            step="5"
-                            value={padding}
-                            onChange={(e) => setPadding(Number(e.target.value))}
-                            className="flex-1 min-w-0 h-2 bg-muted rounded-lg appearance-none cursor-pointer [&::-webkit-slider-thumb]:appearance-none [&::-webkit-slider-thumb]:w-4 [&::-webkit-slider-thumb]:h-4 [&::-webkit-slider-thumb]:rounded-full [&::-webkit-slider-thumb]:bg-primary [&::-moz-range-thumb]:w-4 [&::-moz-range-thumb]:h-4 [&::-moz-range-thumb]:rounded-full [&::-moz-range-thumb]:bg-primary [&::-moz-range-thumb]:border-0"
-                        />
-                        <NumberInput
-                            value={padding}
-                            onValueChange={setPadding}
-                            min={50}
-                            max={200}
-                            step={5}
-                            aria-label="Spacing percentage"
-                        />
-                        <ButtonSmall
-                            type="button"
-                            variant="ghost"
-                            onClick={() => setPadding(100)}
-                            disabled={padding === 100}
-                            className="h-8 w-8 px-0 border border-border bg-background hover:bg-accent disabled:opacity-100 disabled:bg-background"
-                            aria-label="Reset spacing"
-                            title="Reset"
-                        >
-                            <RiRestartLine className="h-3.5 w-3.5" />
-                        </ButtonSmall>
+
+                    {isMobile ? (
+                        <div className="flex items-center gap-2 w-full">
+                            <input
+                                type="range"
+                                min="50"
+                                max="200"
+                                step="5"
+                                value={padding}
+                                onChange={(e) => setPadding(Number(e.target.value))}
+                                className="flex-1 min-w-0 h-3 bg-muted rounded-full appearance-none cursor-pointer [&::-webkit-slider-thumb]:appearance-none [&::-webkit-slider-thumb]:w-5 [&::-webkit-slider-thumb]:h-5 [&::-webkit-slider-thumb]:rounded-full [&::-webkit-slider-thumb]:bg-primary [&::-moz-range-thumb]:w-5 [&::-moz-range-thumb]:h-5 [&::-moz-range-thumb]:rounded-full [&::-moz-range-thumb]:bg-primary [&::-moz-range-thumb]:border-0"
+                                aria-label="Spacing percentage"
+                            />
+
+                            <span className="typography-ui-label font-medium text-foreground tabular-nums rounded-md border border-border bg-background px-2 py-1.5 min-w-[3.75rem] text-center">
+                                {padding}
+                            </span>
+
+                            <ButtonSmall
+                                type="button"
+                                variant="ghost"
+                                onClick={() => setPadding(100)}
+                                disabled={padding === 100}
+                                className="h-8 w-8 px-0 border border-border bg-background hover:bg-accent disabled:opacity-100 disabled:bg-background"
+                                aria-label="Reset spacing"
+                                title="Reset"
+                            >
+                                <RiRestartLine className="h-3.5 w-3.5" />
+                            </ButtonSmall>
+                        </div>
+                    ) : (
+                        <div className="flex items-center gap-3 w-full max-w-md">
+                            <input
+                                type="range"
+                                min="50"
+                                max="200"
+                                step="5"
+                                value={padding}
+                                onChange={(e) => setPadding(Number(e.target.value))}
+                                className="flex-1 min-w-0 h-2 bg-muted rounded-lg appearance-none cursor-pointer [&::-webkit-slider-thumb]:appearance-none [&::-webkit-slider-thumb]:w-4 [&::-webkit-slider-thumb]:h-4 [&::-webkit-slider-thumb]:rounded-full [&::-webkit-slider-thumb]:bg-primary [&::-moz-range-thumb]:w-4 [&::-moz-range-thumb]:h-4 [&::-moz-range-thumb]:rounded-full [&::-moz-range-thumb]:bg-primary [&::-moz-range-thumb]:border-0"
+                            />
+                            <NumberInput
+                                value={padding}
+                                onValueChange={setPadding}
+                                min={50}
+                                max={200}
+                                step={5}
+                                aria-label="Spacing percentage"
+                            />
+                            <ButtonSmall
+                                type="button"
+                                variant="ghost"
+                                onClick={() => setPadding(100)}
+                                disabled={padding === 100}
+                                className="h-8 w-8 px-0 border border-border bg-background hover:bg-accent disabled:opacity-100 disabled:bg-background"
+                                aria-label="Reset spacing"
+                                title="Reset"
+                            >
+                                <RiRestartLine className="h-3.5 w-3.5" />
+                            </ButtonSmall>
+                        </div>
+                    )}
+                </div>
+            )}
+
+            {shouldShow('toolOutput') && (
+                <div className="space-y-4">
+                    <div className="space-y-1">
+                        <h3 className="typography-ui-header font-semibold text-foreground">
+                            Default Tool Output
+                        </h3>
+                        <p className="typography-meta text-muted-foreground">
+                            {TOOL_EXPANSION_OPTIONS.find(o => o.value === toolCallExpansion)?.description}
+                        </p>
+                    </div>
+                    <div className="flex gap-1 w-fit">
+                        {TOOL_EXPANSION_OPTIONS.map((option) => (
+                            <ButtonSmall
+                                key={option.value}
+                                variant={toolCallExpansion === option.value ? 'default' : 'outline'}
+                                className={cn(toolCallExpansion === option.value ? undefined : 'text-foreground')}
+                                onClick={() => setToolCallExpansion(option.value)}
+                            >
+                                {option.label}
+                            </ButtonSmall>
+                        ))}
                     </div>
-                )}
-            </div>
-
-            <div className="space-y-4">
-                <div className="space-y-1">
-                    <h3 className="typography-ui-header font-semibold text-foreground">
-                        Default Tool Output
-                    </h3>
-                    <p className="typography-meta text-muted-foreground">
-                        {TOOL_EXPANSION_OPTIONS.find(o => o.value === toolCallExpansion)?.description}
-                    </p>
                 </div>
-                <div className="flex gap-1 w-fit">
-                    {TOOL_EXPANSION_OPTIONS.map((option) => (
-                        <ButtonSmall
-                            key={option.value}
-                            variant={toolCallExpansion === option.value ? 'default' : 'outline'}
-                            className={cn(toolCallExpansion === option.value ? undefined : 'text-foreground')}
-                            onClick={() => setToolCallExpansion(option.value)}
-                        >
-                            {option.label}
-                        </ButtonSmall>
-                    ))}
-                </div>
-            </div>
+            )}
 
-            {}
-            {!isMobile && (
+            {shouldShow('diffLayout') && !isMobile && (
                 <div className="space-y-4">
                     <div className="space-y-1">
                         <h3 className="typography-ui-header font-semibold text-foreground">
@@ -264,18 +279,19 @@ export const AppearanceSettings: React.FC = () => {
                 </div>
             )}
 
-            {}
-            <label className="flex items-center gap-2 cursor-pointer">
-                <input
-                    type="checkbox"
-                    className="h-3.5 w-3.5 accent-primary"
-                    checked={showReasoningTraces}
-                    onChange={(event) => setShowReasoningTraces(event.target.checked)}
-                />
-                <span className="typography-ui-header font-semibold text-foreground">
-                    Show thinking / reasoning traces
-                </span>
-            </label>
+            {shouldShow('reasoning') && (
+                <label className="flex items-center gap-2 cursor-pointer">
+                    <input
+                        type="checkbox"
+                        className="h-3.5 w-3.5 accent-primary"
+                        checked={showReasoningTraces}
+                        onChange={(event) => setShowReasoningTraces(event.target.checked)}
+                    />
+                    <span className="typography-ui-header font-semibold text-foreground">
+                        Show thinking / reasoning traces
+                    </span>
+                </label>
+            )}
         </div>
     );
 };

packages/ui/src/components/sections/providers/ProvidersSidebar.tsx

@@ -9,31 +9,45 @@ import { cn } from '@/lib/utils';
 
 const ADD_PROVIDER_ID = '__add_provider__';
 
-export const ProvidersSidebar: React.FC = () => {
+interface ProvidersSidebarProps {
+  onItemSelect?: () => void;
+}
+
+export const ProvidersSidebar: React.FC<ProvidersSidebarProps> = ({ onItemSelect }) => {
   const providers = useConfigStore((state) => state.providers);
   const selectedProviderId = useConfigStore((state) => state.selectedProviderId);
   const setSelectedProvider = useConfigStore((state) => state.setSelectedProvider);
   const { isMobile } = useDeviceInfo();
 
+  const [isDesktopRuntime, setIsDesktopRuntime] = React.useState<boolean>(() => {
+    if (typeof window === 'undefined') return false;
+    return typeof window.opencodeDesktop !== 'undefined';
+  });
+
+  React.useEffect(() => {
+    if (typeof window === 'undefined') return;
+    setIsDesktopRuntime(typeof window.opencodeDesktop !== 'undefined');
+  }, []);
+
   return (
-    <div className="flex h-full flex-col bg-sidebar">
+    <div className={cn('flex h-full flex-col', isDesktopRuntime ? 'bg-transparent' : 'bg-sidebar')}>
       <div className={cn('border-b border-border/40 px-3 dark:border-white/10', isMobile ? 'mt-2 py-3' : 'py-3')}>
         <div className="flex items-center justify-between gap-2">
-          <h2 className="typography-ui-label font-semibold text-foreground">Providers</h2>
-          <div className="flex items-center gap-1">
-            <span className="typography-meta text-muted-foreground">{providers.length}</span>
-            <Button
-              type="button"
-              variant="ghost"
-              size="icon"
-              className="h-7 w-7 text-muted-foreground"
-              onClick={() => setSelectedProvider(ADD_PROVIDER_ID)}
-              aria-label="Connect provider"
-              title="Connect provider"
-            >
-              <RiAddLine className="size-4" />
-            </Button>
-          </div>
+          <span className="typography-meta text-muted-foreground">Total {providers.length}</span>
+          <Button
+            type="button"
+            variant="ghost"
+            size="icon"
+            className="h-7 w-7 -my-1 text-muted-foreground"
+            onClick={() => {
+              setSelectedProvider(ADD_PROVIDER_ID);
+              onItemSelect?.();
+            }}
+            aria-label="Connect provider"
+            title="Connect provider"
+          >
+            <RiAddLine className="size-4" />
+          </Button>
         </div>
       </div>
 
@@ -50,32 +64,30 @@ export const ProvidersSidebar: React.FC = () => {
             const isSelected = provider.id === selectedProviderId;
 
             return (
-              <div key={provider.id} className="group transition-all duration-200">
-                <div className="relative">
-                  <div className="w-full flex items-center justify-between py-1.5 px-2 pr-1">
-                    <button
-                      type="button"
-                      onClick={() => setSelectedProvider(provider.id)}
-                      className="flex-1 text-left overflow-hidden"
-                      tabIndex={0}
-                    >
-                      <div className="flex items-center gap-2">
-                        <ProviderLogo providerId={provider.id} className="h-4 w-4 flex-shrink-0" />
-                        <span className={cn(
-                          "typography-ui-label font-medium truncate flex-1 min-w-0",
-                          isSelected
-                            ? "text-primary"
-                            : "text-foreground hover:text-primary/80"
-                        )}>
-                          {provider.name || provider.id}
-                        </span>
-                        <span className="typography-meta text-muted-foreground flex-shrink-0">
-                          {modelCount}
-                        </span>
-                      </div>
-                    </button>
-                  </div>
-                </div>
+              <div
+                key={provider.id}
+                className={cn(
+                  'group relative flex items-center rounded-md px-1.5 py-1 transition-all duration-200',
+                  isSelected ? 'dark:bg-accent/80 bg-primary/12' : 'hover:dark:bg-accent/40 hover:bg-primary/6'
+                )}
+              >
+                <button
+                  type="button"
+                  onClick={() => {
+                    setSelectedProvider(provider.id);
+                    onItemSelect?.();
+                  }}
+                  className="flex min-w-0 flex-1 items-center gap-2 rounded-sm text-left focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary/50"
+                  tabIndex={0}
+                >
+                  <ProviderLogo providerId={provider.id} className="h-4 w-4 flex-shrink-0" />
+                  <span className="typography-ui-label font-normal truncate flex-1 min-w-0 text-foreground">
+                    {provider.name || provider.id}
+                  </span>
+                  <span className="typography-micro text-muted-foreground/60 flex-shrink-0">
+                    {modelCount}
+                  </span>
+                </button>
               </div>
             );
           })

packages/ui/src/components/sections/settings/AboutSettings.tsx

@@ -1,120 +0,0 @@
-import React from 'react';
-import { RiDownloadLine, RiGithubFill, RiLoaderLine, RiTwitterXFill } from '@remixicon/react';
-import { useUpdateStore } from '@/stores/useUpdateStore';
-import { UpdateDialog } from '@/components/ui/UpdateDialog';
-import { cn } from '@/lib/utils';
-
-const GITHUB_URL = 'https://github.com/btriapitsyn/openchamber';
-
-export const AboutSettings: React.FC = () => {
-  const [updateDialogOpen, setUpdateDialogOpen] = React.useState(false);
-  const updateStore = useUpdateStore();
-
-  const currentVersion = updateStore.info?.currentVersion || 'unknown';
-
-  return (
-    <div className="w-full space-y-6">
-      <div className="space-y-1">
-        <h3 className="typography-ui-header font-semibold text-foreground">
-          About OpenChamber
-        </h3>
-      </div>
-
-      {/* Version and Update */}
-      <div className="space-y-3">
-        <div className="flex items-center justify-between">
-          <div className="space-y-0.5">
-            <div className="typography-ui-label text-muted-foreground">Version</div>
-            <div className="typography-ui-header font-mono">{currentVersion}</div>
-          </div>
-
-          {updateStore.checking && (
-            <div className="flex items-center gap-2 text-muted-foreground">
-              <RiLoaderLine className="h-4 w-4 animate-spin" />
-              <span className="typography-meta">Checking...</span>
-            </div>
-          )}
-
-          {!updateStore.checking && updateStore.available && (
-            <button
-              onClick={() => setUpdateDialogOpen(true)}
-              className={cn(
-                'flex items-center gap-2 px-3 py-1.5 rounded-md',
-                'text-sm font-medium',
-                'bg-primary text-primary-foreground',
-                'hover:bg-primary/90',
-                'transition-colors'
-              )}
-            >
-              <RiDownloadLine className="h-4 w-4" />
-              Update to {updateStore.info?.version}
-            </button>
-          )}
-
-          {!updateStore.checking && !updateStore.available && !updateStore.error && (
-            <span className="typography-meta text-muted-foreground">Up to date</span>
-          )}
-        </div>
-
-        {updateStore.error && (
-          <p className="typography-meta text-destructive">{updateStore.error}</p>
-        )}
-
-        <button
-          onClick={() => updateStore.checkForUpdates()}
-          disabled={updateStore.checking}
-          className={cn(
-            'typography-meta text-muted-foreground hover:text-foreground',
-            'underline-offset-2 hover:underline',
-            'disabled:opacity-50 disabled:cursor-not-allowed'
-          )}
-        >
-          Check for updates
-        </button>
-      </div>
-
-      {/* Links */}
-      <div className="flex items-center gap-4">
-        <a
-          href={GITHUB_URL}
-          target="_blank"
-          rel="noopener noreferrer"
-          className={cn(
-            'flex items-center gap-1.5 text-muted-foreground hover:text-foreground',
-            'typography-meta transition-colors'
-          )}
-        >
-          <RiGithubFill className="h-4 w-4" />
-          <span>GitHub</span>
-        </a>
-
-        <a
-          href="https://x.com/btriapitsyn"
-          target="_blank"
-          rel="noopener noreferrer"
-          className={cn(
-            'flex items-center gap-1.5 text-muted-foreground hover:text-foreground',
-            'typography-meta transition-colors'
-          )}
-        >
-          <RiTwitterXFill className="h-4 w-4" />
-          <span>@btriapitsyn</span>
-        </a>
-      </div>
-
-      {/* Update Dialog */}
-      <UpdateDialog
-        open={updateDialogOpen}
-        onOpenChange={setUpdateDialogOpen}
-        info={updateStore.info}
-        downloading={updateStore.downloading}
-        downloaded={updateStore.downloaded}
-        progress={updateStore.progress}
-        error={updateStore.error}
-        onDownload={updateStore.downloadUpdate}
-        onRestart={updateStore.restartToUpdate}
-        runtimeType={updateStore.runtimeType}
-      />
-    </div>
-  );
-};

packages/ui/src/components/sections/settings/SettingsPage.tsx

@@ -1,33 +0,0 @@
-import React from 'react';
-import { AppearanceSettings } from './AppearanceSettings';
-import { AboutSettings } from './AboutSettings';
-import { SessionRetentionSettings } from './SessionRetentionSettings';
-import { DefaultsSettings } from './DefaultsSettings';
-import { ScrollableOverlay } from '@/components/ui/ScrollableOverlay';
-import { useDeviceInfo } from '@/lib/device';
-import { isWebRuntime } from '@/lib/desktop';
-
-export const SettingsPage: React.FC = () => {
-    const { isMobile } = useDeviceInfo();
-    const showAbout = isMobile && isWebRuntime();
-
-    return (
-        <ScrollableOverlay
-            outerClassName="h-full"
-            className="settings-page-body mx-auto max-w-3xl space-y-3 p-3 sm:space-y-6 sm:p-6"
-        >
-            <AppearanceSettings />
-            <div className="border-t border-border/40 pt-6">
-                <DefaultsSettings />
-            </div>
-            <div className="border-t border-border/40 pt-6">
-                <SessionRetentionSettings />
-            </div>
-            {showAbout && (
-                <div className="border-t border-border/40 pt-6">
-                    <AboutSettings />
-                </div>
-            )}
-        </ScrollableOverlay>
-    );
-};

packages/ui/src/components/sections/shared/SettingsPageLayout.tsx

@@ -0,0 +1,44 @@
+import React from 'react';
+import { ScrollableOverlay } from '@/components/ui/ScrollableOverlay';
+import { cn } from '@/lib/utils';
+
+interface SettingsPageLayoutProps {
+  /** Page content */
+  children: React.ReactNode;
+  /** Additional className for the content container */
+  className?: string;
+  /** Additional className for the outer ScrollableOverlay */
+  outerClassName?: string;
+}
+
+/**
+ * Standard layout wrapper for settings page content.
+ * Provides scrolling and centered max-width container.
+ *
+ * @example
+ * <SettingsPageLayout>
+ *   <SettingsSection title="General">
+ *     <SomeSettingsForm />
+ *   </SettingsSection>
+ *   <SettingsSection title="Advanced" divider>
+ *     <OtherSettingsForm />
+ *   </SettingsSection>
+ * </SettingsPageLayout>
+ */
+export const SettingsPageLayout: React.FC<SettingsPageLayoutProps> = ({
+  children,
+  className,
+  outerClassName,
+}) => {
+  return (
+    <ScrollableOverlay
+      outerClassName={cn('h-full', outerClassName)}
+      className={cn(
+        'mx-auto max-w-3xl space-y-6 p-3 sm:p-6',
+        className
+      )}
+    >
+      {children}
+    </ScrollableOverlay>
+  );
+};

packages/ui/src/components/sections/shared/SettingsSection.tsx

@@ -0,0 +1,62 @@
+import React from 'react';
+import { cn } from '@/lib/utils';
+
+interface SettingsSectionProps {
+  /** Section content */
+  children: React.ReactNode;
+  /** Optional section title */
+  title?: string;
+  /** Optional section description */
+  description?: string;
+  /** If true, adds a top border divider */
+  divider?: boolean;
+  /** Additional className */
+  className?: string;
+}
+
+/**
+ * Standard section wrapper for settings page content.
+ * Provides consistent spacing and optional divider.
+ *
+ * @example
+ * <SettingsSection title="Appearance" description="Customize the look and feel">
+ *   <ThemeSelector />
+ *   <FontSizeSelector />
+ * </SettingsSection>
+ *
+ * <SettingsSection divider>
+ *   <DangerZoneSettings />
+ * </SettingsSection>
+ */
+export const SettingsSection: React.FC<SettingsSectionProps> = ({
+  children,
+  title,
+  description,
+  divider = false,
+  className,
+}) => {
+  return (
+    <div
+      className={cn(
+        divider && 'border-t border-border/40 pt-6',
+        className
+      )}
+    >
+      {(title || description) && (
+        <div className="mb-4 space-y-1">
+          {title && (
+            <h3 className="typography-ui-header font-semibold text-foreground">
+              {title}
+            </h3>
+          )}
+          {description && (
+            <p className="typography-meta text-muted-foreground">
+              {description}
+            </p>
+          )}
+        </div>
+      )}
+      {children}
+    </div>
+  );
+};

packages/ui/src/components/sections/shared/SettingsSidebarHeader.tsx

@@ -0,0 +1,63 @@
+import React from 'react';
+import { Button } from '@/components/ui/button';
+import { RiAddLine } from '@remixicon/react';
+import { useDeviceInfo } from '@/lib/device';
+import { cn } from '@/lib/utils';
+
+interface SettingsSidebarHeaderProps {
+  /** Total count to display (e.g., "Total 5") */
+  count: number;
+  /** Callback when add button is clicked. If undefined, no add button is shown. */
+  onAdd?: () => void;
+  /** Custom label prefix (default: "Total") */
+  label?: string;
+  /** Aria label for the add button */
+  addButtonLabel?: string;
+}
+
+/**
+ * Standard header for settings sidebars.
+ * Displays "Total X" on the left and an optional add button on the right.
+ *
+ * @example
+ * <SettingsSidebarHeader
+ *   count={agents.length}
+ *   onAdd={() => setCreateDialogOpen(true)}
+ *   addButtonLabel="Create new agent"
+ * />
+ */
+export const SettingsSidebarHeader: React.FC<SettingsSidebarHeaderProps> = ({
+  count,
+  onAdd,
+  label = 'Total',
+  addButtonLabel = 'Add new item',
+}) => {
+  const { isMobile } = useDeviceInfo();
+
+  return (
+    <div
+      className={cn(
+        'border-b border-border/40 px-3 dark:border-white/10',
+        isMobile ? 'mt-2 py-3' : 'py-3'
+      )}
+    >
+      <div className="flex items-center justify-between gap-2">
+        <span className="typography-meta text-muted-foreground">
+          {label} {count}
+        </span>
+        {onAdd && (
+          <Button
+            type="button"
+            variant="ghost"
+            size="icon"
+            className="h-7 w-7 -my-1 text-muted-foreground"
+            onClick={onAdd}
+            aria-label={addButtonLabel}
+          >
+            <RiAddLine className="size-4" />
+          </Button>
+        )}
+      </div>
+    </div>
+  );
+};

packages/ui/src/components/sections/shared/SettingsSidebarItem.tsx

@@ -0,0 +1,134 @@
+import React from 'react';
+import { Button } from '@/components/ui/button';
+import {
+  DropdownMenu,
+  DropdownMenuContent,
+  DropdownMenuItem,
+  DropdownMenuTrigger,
+} from '@/components/ui/dropdown-menu';
+import { RiMore2Line } from '@remixicon/react';
+import { cn } from '@/lib/utils';
+
+export interface SettingsSidebarItemAction {
+  /** Label shown in dropdown menu */
+  label: string;
+  /** Icon component to show before label */
+  icon?: React.ComponentType<{ className?: string }>;
+  /** Callback when action is clicked */
+  onClick: () => void;
+  /** If true, uses destructive styling (red text) */
+  destructive?: boolean;
+}
+
+interface SettingsSidebarItemProps {
+  /** Primary title text */
+  title: React.ReactNode;
+  /** Secondary metadata text (shown below title) */
+  metadata?: React.ReactNode;
+  /** Whether this item is currently selected */
+  selected?: boolean;
+  /** Callback when item is clicked */
+  onSelect: () => void;
+  /** Optional icon to show before title */
+  icon?: React.ReactNode;
+  /** Actions shown in dropdown menu. If empty/undefined, no dropdown is shown. */
+  actions?: SettingsSidebarItemAction[];
+  /** Additional className for the outer container */
+  className?: string;
+}
+
+/**
+ * Standard list item for settings sidebars.
+ * Provides consistent styling for title, metadata, selection state, and optional actions dropdown.
+ *
+ * @example
+ * <SettingsSidebarItem
+ *   title={agent.name}
+ *   metadata={agent.description}
+ *   selected={selectedId === agent.id}
+ *   onSelect={() => setSelectedId(agent.id)}
+ *   icon={<RiRobotLine className="h-4 w-4" />}
+ *   actions={[
+ *     { label: 'Duplicate', icon: RiFileCopyLine, onClick: handleDuplicate },
+ *     { label: 'Delete', icon: RiDeleteBinLine, onClick: handleDelete, destructive: true },
+ *   ]}
+ * />
+ */
+export const SettingsSidebarItem: React.FC<SettingsSidebarItemProps> = ({
+  title,
+  metadata,
+  selected = false,
+  onSelect,
+  icon,
+  actions,
+  className,
+}) => {
+  const hasActions = actions && actions.length > 0;
+
+  return (
+    <div
+      className={cn(
+        'group relative flex items-center rounded-md px-1.5 py-1 transition-all duration-200',
+        selected
+          ? 'dark:bg-accent/80 bg-primary/12'
+          : 'hover:dark:bg-accent/40 hover:bg-primary/6',
+        className
+      )}
+    >
+      <div className="flex min-w-0 flex-1 items-center">
+        <button
+          onClick={onSelect}
+          className="flex min-w-0 flex-1 flex-col gap-0 rounded-sm text-left focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary/50"
+          tabIndex={0}
+        >
+          <div className="flex items-center gap-1.5">
+            {icon}
+            <span className="typography-ui-label font-normal truncate text-foreground">
+              {title}
+            </span>
+          </div>
+
+          {metadata && (
+            <div className="typography-micro text-muted-foreground/60 truncate leading-tight">
+              {metadata}
+            </div>
+          )}
+        </button>
+
+        {hasActions && (
+          <DropdownMenu>
+            <DropdownMenuTrigger asChild>
+              <Button
+                size="icon"
+                variant="ghost"
+                className="h-6 w-6 flex-shrink-0 -mr-1 opacity-100 transition-opacity md:opacity-0 md:group-hover:opacity-100"
+              >
+                <RiMore2Line className="h-3.5 w-3.5" />
+              </Button>
+            </DropdownMenuTrigger>
+            <DropdownMenuContent align="end" className="w-fit min-w-20">
+              {actions.map((action, index) => {
+                const Icon = action.icon;
+                return (
+                  <DropdownMenuItem
+                    key={index}
+                    onClick={(e) => {
+                      e.stopPropagation();
+                      action.onClick();
+                    }}
+                    className={cn(
+                      action.destructive && 'text-destructive focus:text-destructive'
+                    )}
+                  >
+                    {Icon && <Icon className="h-4 w-4 mr-px" />}
+                    {action.label}
+                  </DropdownMenuItem>
+                );
+              })}
+            </DropdownMenuContent>
+          </DropdownMenu>
+        )}
+      </div>
+    </div>
+  );
+};

packages/ui/src/components/sections/shared/SettingsSidebarLayout.tsx

@@ -0,0 +1,65 @@
+import React from 'react';
+import { ScrollableOverlay } from '@/components/ui/ScrollableOverlay';
+import { cn } from '@/lib/utils';
+
+interface SettingsSidebarLayoutProps {
+  /** Header content (typically SettingsSidebarHeader) */
+  header?: React.ReactNode;
+  /** Footer content (e.g., AboutSettings on mobile) */
+  footer?: React.ReactNode;
+  /** Main scrollable content */
+  children: React.ReactNode;
+  /** Additional className for the outer container */
+  className?: string;
+}
+
+/**
+ * Standard layout wrapper for settings sidebars.
+ * Provides consistent background, scrolling, and header/footer slots.
+ *
+ * @example
+ * <SettingsSidebarLayout
+ *   header={<SettingsSidebarHeader count={items.length} onAdd={handleAdd} />}
+ * >
+ *   {items.map(item => (
+ *     <SettingsSidebarItem key={item.id} ... />
+ *   ))}
+ * </SettingsSidebarLayout>
+ */
+export const SettingsSidebarLayout: React.FC<SettingsSidebarLayoutProps> = ({
+  header,
+  footer,
+  children,
+  className,
+}) => {
+  const [isDesktopRuntime, setIsDesktopRuntime] = React.useState<boolean>(() => {
+    if (typeof window === 'undefined') return false;
+    return typeof window.opencodeDesktop !== 'undefined';
+  });
+
+  React.useEffect(() => {
+    if (typeof window === 'undefined') return;
+    setIsDesktopRuntime(typeof window.opencodeDesktop !== 'undefined');
+  }, []);
+
+  return (
+    <div
+      className={cn(
+        'flex h-full flex-col',
+        isDesktopRuntime ? 'bg-transparent' : 'bg-sidebar',
+        className
+      )}
+    >
+      {header}
+
+      <ScrollableOverlay
+        outerClassName="flex-1 min-h-0"
+        className="space-y-1 px-3 py-2 overflow-x-hidden"
+      >
+        {children}
+      </ScrollableOverlay>
+
+      {footer}
+    </div>
+  );
+};

packages/ui/src/components/sections/shared/index.ts

@@ -0,0 +1,56 @@
+/**
+ * Shared boilerplate components for settings sections.
+ *
+ * These components provide consistent styling and behavior for settings sidebars and pages.
+ * Use them as building blocks when creating new settings sections.
+ *
+ * @example Sidebar usage:
+ * ```tsx
+ * import {
+ *   SettingsSidebarLayout,
+ *   SettingsSidebarHeader,
+ *   SettingsSidebarItem,
+ * } from '@/components/sections/shared';
+ *
+ * export const MySidebar = () => (
+ *   <SettingsSidebarLayout
+ *     header={<SettingsSidebarHeader count={items.length} onAdd={handleAdd} />}
+ *   >
+ *     {items.map(item => (
+ *       <SettingsSidebarItem
+ *         key={item.id}
+ *         title={item.name}
+ *         metadata={item.description}
+ *         selected={selectedId === item.id}
+ *         onSelect={() => setSelectedId(item.id)}
+ *         actions={[
+ *           { label: 'Delete', onClick: () => handleDelete(item.id), destructive: true }
+ *         ]}
+ *       />
+ *     ))}
+ *   </SettingsSidebarLayout>
+ * );
+ * ```
+ *
+ * @example Page usage:
+ * ```tsx
+ * import { SettingsPageLayout, SettingsSection } from '@/components/sections/shared';
+ *
+ * export const MyPage = () => (
+ *   <SettingsPageLayout>
+ *     <SettingsSection title="General Settings">
+ *       <MySettingsForm />
+ *     </SettingsSection>
+ *     <SettingsSection title="Advanced" divider>
+ *       <AdvancedSettingsForm />
+ *     </SettingsSection>
+ *   </SettingsPageLayout>
+ * );
+ * ```
+ */
+
+export { SettingsSidebarLayout } from './SettingsSidebarLayout';
+export { SettingsSidebarHeader } from './SettingsSidebarHeader';
+export { SettingsSidebarItem, type SettingsSidebarItemAction } from './SettingsSidebarItem';
+export { SettingsPageLayout } from './SettingsPageLayout';
+export { SettingsSection } from './SettingsSection';

packages/ui/src/components/views/SettingsView.tsx

@@ -0,0 +1,386 @@
+import React from 'react';
+import { cn } from '@/lib/utils';
+import { SIDEBAR_SECTIONS } from '@/constants/sidebar';
+import type { SidebarSection } from '@/constants/sidebar';
+import { RiArrowLeftSLine, RiCloseLine } from '@remixicon/react';
+import { Tooltip, TooltipContent, TooltipTrigger } from '@/components/ui/tooltip';
+import { AgentsSidebar } from '@/components/sections/agents/AgentsSidebar';
+import { AgentsPage } from '@/components/sections/agents/AgentsPage';
+import { CommandsSidebar } from '@/components/sections/commands/CommandsSidebar';
+import { CommandsPage } from '@/components/sections/commands/CommandsPage';
+import { ProvidersSidebar } from '@/components/sections/providers/ProvidersSidebar';
+import { ProvidersPage } from '@/components/sections/providers/ProvidersPage';
+import { GitIdentitiesSidebar } from '@/components/sections/git-identities/GitIdentitiesSidebar';
+import { GitIdentitiesPage } from '@/components/sections/git-identities/GitIdentitiesPage';
+import { OpenChamberPage } from '@/components/sections/openchamber/OpenChamberPage';
+import { OpenChamberSidebar, type OpenChamberSection } from '@/components/sections/openchamber/OpenChamberSidebar';
+import { ErrorBoundary } from '@/components/ui/ErrorBoundary';
+import { useDeviceInfo } from '@/lib/device';
+
+const SETTINGS_SECTIONS = (() => {
+  const filtered = SIDEBAR_SECTIONS.filter(section => section.id !== 'sessions');
+  const settingsSection = filtered.find(s => s.id === 'settings');
+  const otherSections = filtered.filter(s => s.id !== 'settings');
+  return settingsSection ? [settingsSection, ...otherSections] : filtered;
+})();
+
+// Same constraints as main sidebar
+const SETTINGS_SIDEBAR_MIN_WIDTH = 200;
+const SETTINGS_SIDEBAR_MAX_WIDTH = 500;
+const SETTINGS_SIDEBAR_DEFAULT_WIDTH = 264;
+
+interface SettingsViewProps {
+  onClose?: () => void;
+}
+
+export const SettingsView: React.FC<SettingsViewProps> = ({ onClose }) => {
+  const { isMobile } = useDeviceInfo();
+  const [activeTab, setActiveTab] = React.useState<SidebarSection>('settings');
+  const [selectedOpenChamberSection, setSelectedOpenChamberSection] = React.useState<OpenChamberSection>('visual');
+  // Mobile drill-down state: show page content instead of sidebar
+  const [showMobilePageContent, setShowMobilePageContent] = React.useState(false);
+  const [sidebarWidth, setSidebarWidth] = React.useState(() => {
+    // Use proportional width like main sidebar (20% of window)
+    if (typeof window !== 'undefined') {
+      return Math.min(
+        SETTINGS_SIDEBAR_MAX_WIDTH,
+        Math.max(SETTINGS_SIDEBAR_MIN_WIDTH, Math.floor(window.innerWidth * 0.2))
+      );
+    }
+    return SETTINGS_SIDEBAR_DEFAULT_WIDTH;
+  });
+  const [hasManuallyResized, setHasManuallyResized] = React.useState(false);
+  const [isResizing, setIsResizing] = React.useState(false);
+  const startXRef = React.useRef(0);
+  const startWidthRef = React.useRef(sidebarWidth);
+
+  const [isDesktopApp, setIsDesktopApp] = React.useState<boolean>(() => {
+    if (typeof window === 'undefined') return false;
+    return typeof (window as typeof window & { opencodeDesktop?: unknown }).opencodeDesktop !== 'undefined';
+  });
+
+  const isMacPlatform = React.useMemo(() => {
+    if (typeof navigator === 'undefined') return false;
+    return /Macintosh|Mac OS X/.test(navigator.userAgent || '');
+  }, []);
+
+  React.useEffect(() => {
+    if (typeof window === 'undefined') return;
+    setIsDesktopApp(typeof (window as typeof window & { opencodeDesktop?: unknown }).opencodeDesktop !== 'undefined');
+  }, []);
+
+  // Update proportional width on window resize (if not manually resized)
+  React.useEffect(() => {
+    if (typeof window === 'undefined') return;
+
+    const handleResize = () => {
+      if (!hasManuallyResized) {
+        const proportionalWidth = Math.min(
+          SETTINGS_SIDEBAR_MAX_WIDTH,
+          Math.max(SETTINGS_SIDEBAR_MIN_WIDTH, Math.floor(window.innerWidth * 0.2))
+        );
+        setSidebarWidth(proportionalWidth);
+      }
+    };
+
+    window.addEventListener('resize', handleResize);
+    return () => window.removeEventListener('resize', handleResize);
+  }, [hasManuallyResized]);
+
+  // Resize handling
+  React.useEffect(() => {
+    if (!isResizing) return;
+
+    const handlePointerMove = (event: PointerEvent) => {
+      const delta = event.clientX - startXRef.current;
+      const nextWidth = Math.min(
+        SETTINGS_SIDEBAR_MAX_WIDTH,
+        Math.max(SETTINGS_SIDEBAR_MIN_WIDTH, startWidthRef.current + delta)
+      );
+      setSidebarWidth(nextWidth);
+      setHasManuallyResized(true);
+    };
+
+    const handlePointerUp = () => setIsResizing(false);
+
+    window.addEventListener('pointermove', handlePointerMove);
+    window.addEventListener('pointerup', handlePointerUp, { once: true });
+
+    return () => {
+      window.removeEventListener('pointermove', handlePointerMove);
+      window.removeEventListener('pointerup', handlePointerUp);
+    };
+  }, [isResizing]);
+
+  const handlePointerDown = (event: React.PointerEvent) => {
+    setIsResizing(true);
+    startXRef.current = event.clientX;
+    startWidthRef.current = sidebarWidth;
+    event.preventDefault();
+  };
+
+  // Draggable header for Tauri desktop
+  const handleDragStart = React.useCallback(async (e: React.MouseEvent) => {
+    if ((e.target as HTMLElement).closest('button, a, input, select, textarea')) return;
+    if (e.button !== 0) return;
+
+    if (isDesktopApp) {
+      try {
+        const { getCurrentWindow } = await import('@tauri-apps/api/window');
+        const window = getCurrentWindow();
+        await window.startDragging();
+      } catch (error) {
+        console.error('Failed to start window dragging:', error);
+      }
+    }
+  }, [isDesktopApp]);
+
+  // Active tab can be dragged (like main header)
+  const handleActiveTabDragStart = React.useCallback(async (e: React.MouseEvent) => {
+    if (e.button !== 0) return;
+
+    if (isDesktopApp) {
+      try {
+        const { getCurrentWindow } = await import('@tauri-apps/api/window');
+        const window = getCurrentWindow();
+        await window.startDragging();
+      } catch (error) {
+        console.error('Failed to start window dragging:', error);
+      }
+    }
+  }, [isDesktopApp]);
+
+  const handleTabChange = React.useCallback((tab: SidebarSection) => {
+    setActiveTab(tab);
+    // Reset mobile drill-down state when changing tabs
+    setShowMobilePageContent(false);
+  }, []);
+
+  // Handle mobile sidebar item selection (drill-down to page)
+  const handleMobileSidebarClick = React.useCallback(() => {
+    if (isMobile) {
+      setShowMobilePageContent(true);
+    }
+  }, [isMobile]);
+
+  const renderSidebarContent = () => {
+    switch (activeTab) {
+      case 'settings':
+        return (
+          <OpenChamberSidebar
+            selectedSection={selectedOpenChamberSection}
+            onSelectSection={(section) => {
+              setSelectedOpenChamberSection(section);
+              handleMobileSidebarClick();
+            }}
+          />
+        );
+      case 'agents':
+        return <AgentsSidebar onItemSelect={handleMobileSidebarClick} />;
+      case 'commands':
+        return <CommandsSidebar onItemSelect={handleMobileSidebarClick} />;
+      case 'providers':
+        return <ProvidersSidebar onItemSelect={handleMobileSidebarClick} />;
+      case 'git-identities':
+        return <GitIdentitiesSidebar onItemSelect={handleMobileSidebarClick} />;
+      default:
+        return null;
+    }
+  };
+
+  const hasSidebar = true; // All tabs now have sidebars
+
+  const renderPageContent = () => {
+    switch (activeTab) {
+      case 'agents':
+        return <AgentsPage />;
+      case 'commands':
+        return <CommandsPage />;
+      case 'providers':
+        return <ProvidersPage />;
+      case 'git-identities':
+        return <GitIdentitiesPage />;
+      case 'settings':
+        return <OpenChamberPage section={selectedOpenChamberSection} />;
+      default:
+        return null;
+    }
+  };
+
+  // Keyboard shortcut display based on platform
+  const shortcutKey = isMacPlatform ? '⌘' : 'Ctrl';
+
+  // Desktop padding for Mac titlebar area
+  const desktopPaddingClass = React.useMemo(() => {
+    if (isDesktopApp && isMacPlatform) {
+      return 'pl-[5.75rem]'; // Space for traffic lights
+    }
+    return '';
+  }, [isDesktopApp, isMacPlatform]);
+
+  const showLeadingDivider = isDesktopApp && isMacPlatform;
+
+  return (
+    <div className={cn('flex h-full flex-col overflow-hidden', isDesktopApp ? 'bg-transparent' : 'bg-background')}>
+      {/* Header with tabs and close button */}
+      <div
+        onMouseDown={!isMobile ? handleDragStart : undefined}
+        className={cn(
+          'flex select-none items-center justify-between border-b',
+          isMobile ? 'h-auto px-3 py-2' : 'app-region-drag h-12',
+          !isMobile && desktopPaddingClass,
+          isDesktopApp ? 'bg-background' : 'bg-background/95 backdrop-blur supports-[backdrop-filter]:bg-background/80'
+        )}
+        style={{ borderColor: 'var(--interactive-border)' }}
+      >
+        {/* Mobile: back button when drilling down */}
+        {isMobile && showMobilePageContent && (
+          <button
+            type="button"
+            onClick={() => setShowMobilePageContent(false)}
+            aria-label="Back"
+            className="inline-flex h-9 w-9 flex-shrink-0 items-center justify-center p-2 text-muted-foreground hover:text-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary"
+          >
+            <RiArrowLeftSLine className="h-5 w-5" />
+          </button>
+        )}
+
+        {/* Mobile: spacer to push tabs to the right */}
+        {isMobile && <div className="flex-1" />}
+
+        <div className={cn('flex items-center', isMobile ? 'gap-1' : 'h-full')}>
+          {/* Leading divider before first tab - only on Mac desktop */}
+          {!isMobile && showLeadingDivider && <div className="h-full w-px bg-border" aria-hidden="true" />}
+          {SETTINGS_SECTIONS.map(({ id, label, icon: Icon }) => {
+            const isActive = activeTab === id;
+            const PhosphorIcon = Icon as React.ComponentType<{ className?: string; weight?: string }>;
+
+            if (isMobile) {
+              // Mobile: icon-only buttons
+              return (
+                <Tooltip key={id} delayDuration={500}>
+                  <TooltipTrigger asChild>
+                    <button
+                      onClick={() => handleTabChange(id)}
+                      className={cn(
+                        'relative flex h-9 w-9 items-center justify-center rounded-md transition-colors',
+                        'hover:text-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary',
+                        isActive ? 'text-foreground' : 'text-muted-foreground'
+                      )}
+                      aria-pressed={isActive}
+                      aria-label={label}
+                    >
+                      <PhosphorIcon className="h-5 w-5" weight="regular" />
+                    </button>
+                  </TooltipTrigger>
+                  <TooltipContent>
+                    <p>{label}</p>
+                  </TooltipContent>
+                </Tooltip>
+              );
+            }
+
+            // Desktop: full tabs with text and dividers
+            return (
+              <React.Fragment key={id}>
+                <button
+                  onClick={() => handleTabChange(id)}
+                  onMouseDown={isActive ? handleActiveTabDragStart : undefined}
+                  className={cn(
+                    'relative flex h-full items-center gap-2 px-4 typography-ui-label font-medium transition-colors',
+                    isActive ? 'app-region-drag' : 'app-region-no-drag',
+                    'hover:text-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-primary',
+                    isActive ? 'text-foreground' : 'text-muted-foreground'
+                  )}
+                  aria-pressed={isActive}
+                  aria-label={label}
+                >
+                  <PhosphorIcon className="h-4 w-4" weight="regular" />
+                  <span className="header-tab-label">{label}</span>
+                </button>
+                {/* Vertical divider after each tab */}
+                <div className="h-full w-px bg-border" aria-hidden="true" />
+              </React.Fragment>
+            );
+          })}
+        </div>
+
+        {onClose && (
+          <div className={cn('flex items-center', isMobile ? '' : 'pr-3')}>
+            <Tooltip delayDuration={500}>
+              <TooltipTrigger asChild>
+                <button
+                  type="button"
+                  onClick={onClose}
+                  aria-label="Close settings"
+                  className={cn(
+                    'inline-flex h-9 w-9 items-center justify-center p-2 text-muted-foreground hover:text-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary',
+                    !isMobile && 'app-region-no-drag'
+                  )}
+                >
+                  <RiCloseLine className="h-5 w-5" />
+                </button>
+              </TooltipTrigger>
+              <TooltipContent>
+                <p>Close Settings ({shortcutKey}+,)</p>
+              </TooltipContent>
+            </Tooltip>
+          </div>
+        )}
+      </div>
+
+      {/* Content area */}
+      <div className="flex flex-1 overflow-hidden">
+        {/* Mobile: show sidebar OR page content based on drill-down state */}
+        {isMobile ? (
+          showMobilePageContent ? (
+            <div className="flex-1 overflow-hidden bg-background">
+              <ErrorBoundary>{renderPageContent()}</ErrorBoundary>
+            </div>
+          ) : (
+            <div className="flex-1 overflow-hidden bg-sidebar">
+              <ErrorBoundary>{renderSidebarContent()}</ErrorBoundary>
+            </div>
+          )
+        ) : (
+          /* Desktop: show both sidebar and page content side by side */
+          <>
+            {hasSidebar && (
+              <div
+                className={cn(
+                  'relative overflow-hidden border-r',
+                  isDesktopApp
+                    ? 'bg-[color:var(--sidebar-overlay-strong)] backdrop-blur supports-[backdrop-filter]:bg-[color:var(--sidebar-overlay-soft)]'
+                    : 'bg-sidebar',
+                  isResizing ? 'transition-none' : ''
+                )}
+                style={{
+                  width: `${sidebarWidth}px`,
+                  minWidth: `${sidebarWidth}px`,
+                  borderColor: 'var(--interactive-border)',
+                }}
+              >
+                {/* Resize handle */}
+                <div
+                  className={cn(
+                    'absolute right-0 top-0 z-20 h-full w-[6px] -mr-[3px] cursor-col-resize',
+                    isResizing ? 'bg-primary/30' : 'bg-transparent hover:bg-primary/20'
+                  )}
+                  onPointerDown={handlePointerDown}
+                  role="separator"
+                  aria-orientation="vertical"
+                  aria-label="Resize settings sidebar"
+                />
+                <ErrorBoundary>{renderSidebarContent()}</ErrorBoundary>
+              </div>
+            )}
+
+            <div className="flex-1 overflow-hidden bg-background">
+              <ErrorBoundary>{renderPageContent()}</ErrorBoundary>
+            </div>
+          </>
+        )}
+      </div>
+    </div>
+  );
+};

packages/ui/src/components/views/index.ts

@@ -2,3 +2,4 @@ export { ChatView } from './ChatView';
 export { GitView } from './GitView';
 export { DiffView, useDiffFileCount } from './DiffView';
 export { TerminalView } from './TerminalView';
+export { SettingsView } from './SettingsView';

packages/ui/src/constants/sidebar.ts

@@ -1,4 +1,4 @@
-import { RiBrainAi3Line, RiChatAi3Line, RiCommandLine, RiGitBranchLine, RiPaintBrushLine, RiStackLine } from '@remixicon/react';
+import { RiBrainAi3Line, RiChatAi3Line, RiCommandLine, RiGitBranchLine, RiSettings3Line, RiStackLine } from '@remixicon/react';
 import type { ComponentType } from 'react';
 
 export type SidebarSection = 'sessions' | 'agents' | 'commands' | 'providers' | 'git-identities' | 'settings';
@@ -46,9 +46,9 @@ export const SIDEBAR_SECTIONS: SidebarSectionConfig[] = [
     },
     {
         id: 'settings',
-        label: 'Appearance',
-        description: 'Fine-tune themes, fonts, and typography across the interface.',
-        icon: RiPaintBrushLine,
+        label: 'OpenChamber',
+        description: 'OpenChamber app settings: themes, fonts, and preferences.',
+        icon: RiSettings3Line,
     },
 ];
 

packages/ui/src/hooks/useKeyboardShortcuts.ts

@@ -118,7 +118,7 @@ export const useKeyboardShortcuts = () => {
         return;
       }
 
-      if (e.ctrlKey && !e.metaKey && !e.shiftKey && e.key === ',') {
+      if ((e.ctrlKey || e.metaKey) && !e.shiftKey && e.key === ',') {
         e.preventDefault();
         const { isSettingsDialogOpen } = useUIStore.getState();
         setSettingsDialogOpen(!isSettingsDialogOpen);
@@ -144,6 +144,34 @@ export const useKeyboardShortcuts = () => {
       }
 
       if (e.key === 'Escape') {
+        const {
+          isSettingsDialogOpen,
+          isCommandPaletteOpen,
+          isHelpDialogOpen,
+          isSessionSwitcherOpen,
+          isSessionCreateDialogOpen,
+          isAboutDialogOpen,
+          activeMainTab,
+        } = useUIStore.getState();
+
+        // If settings is open, close it
+        if (isSettingsDialogOpen) {
+          e.preventDefault();
+          setSettingsDialogOpen(false);
+          resetAbortPriming();
+          return;
+        }
+
+        // Check if any overlay is open or not on chat tab - don't process abort
+        const hasOverlay = isCommandPaletteOpen || isHelpDialogOpen || isSessionSwitcherOpen || isSessionCreateDialogOpen || isAboutDialogOpen;
+        const isChatActive = activeMainTab === 'chat';
+
+        if (hasOverlay || !isChatActive) {
+          resetAbortPriming();
+          return;
+        }
+
+        // Double-ESC abort logic - only when on chat tab with no overlays
         const sessionId = currentSessionId;
         const canAbortNow = working.canAbort && Boolean(sessionId);
         if (!canAbortNow) {