feat: add settings dialog and header button for mobile view

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

@@ -5,7 +5,7 @@ import {
   TooltipTrigger,
 } from '@/components/ui/tooltip';
 
-import { RiChat4Line, RiCodeLine, RiGitBranchLine, RiLayoutLeftLine, RiPlayListAddLine, RiTerminalBoxLine, type RemixiconComponentType } from '@remixicon/react';
+import { RiChat4Line, RiCodeLine, RiGitBranchLine, RiLayoutLeftLine, RiPlayListAddLine, RiSettings3Line, RiTerminalBoxLine, type RemixiconComponentType } from '@remixicon/react';
 import { useUIStore, type MainTab } from '@/stores/useUIStore';
 import { useConfigStore } from '@/stores/useConfigStore';
 import { useSessionStore } from '@/stores/useSessionStore';
@@ -82,6 +82,7 @@ export const FixedSessionsButton: React.FC = () => {
 export const Header: React.FC = () => {
   const setSessionSwitcherOpen = useUIStore((state) => state.setSessionSwitcherOpen);
   const toggleSidebar = useUIStore((state) => state.toggleSidebar);
+  const setSettingsDialogOpen = useUIStore((state) => state.setSettingsDialogOpen);
   const isSidebarOpen = useUIStore((state) => state.isSidebarOpen);
   const sidebarWidth = useUIStore((state) => state.sidebarWidth);
   const activeMainTab = useUIStore((state) => state.activeMainTab);
@@ -134,6 +135,11 @@ export const Header: React.FC = () => {
     toggleSidebar();
   }, [isMobile, isSessionSwitcherOpen, setSessionSwitcherOpen, toggleSidebar]);
 
+  const handleOpenSettings = React.useCallback(() => {
+    setSessionSwitcherOpen(false);
+    setSettingsDialogOpen(true);
+  }, [setSessionSwitcherOpen, setSettingsDialogOpen]);
+
   const headerIconButtonClass = 'app-region-no-drag inline-flex h-9 w-9 items-center justify-center gap-2 p-2 typography-ui-label font-medium text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary disabled:pointer-events-none disabled:opacity-50 hover:text-foreground';
 
   const desktopPaddingClass = React.useMemo(() => {
@@ -415,6 +421,22 @@ export const Header: React.FC = () => {
             );
           })}
         </div>
+
+        <Tooltip delayDuration={500}>
+          <TooltipTrigger asChild>
+            <button
+              type="button"
+              onClick={handleOpenSettings}
+              aria-label="Open settings"
+              className={headerIconButtonClass}
+            >
+              <RiSettings3Line className="h-5 w-5" />
+            </button>
+          </TooltipTrigger>
+          <TooltipContent>
+            <p>Settings</p>
+          </TooltipContent>
+        </Tooltip>
       </div>
     </div>
   );

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

@@ -137,7 +137,10 @@ export const SettingsDialog: React.FC<SettingsDialogProps> = ({ isOpen, onClose
   );
 
   const mainContent = (
-    <div className="flex flex-1 flex-col overflow-hidden">
+    <div className={cn(
+      'flex flex-col min-h-0',
+      isMobile ? 'h-full overflow-hidden' : 'flex-1 overflow-hidden'
+    )}>
       <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;
@@ -204,6 +207,7 @@ export const SettingsDialog: React.FC<SettingsDialogProps> = ({ isOpen, onClose
         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">

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

@@ -8,6 +8,7 @@ import { cn } from '@/lib/utils';
 import { ButtonSmall } from '@/components/ui/button-small';
 import { NumberInput } from '@/components/ui/number-input';
 import { isVSCodeRuntime } from '@/lib/desktop';
+import { useDeviceInfo } from '@/lib/device';
 
 interface Option<T extends string> {
     id: T;
@@ -55,6 +56,7 @@ const DIFF_LAYOUT_OPTIONS: Option<'dynamic' | 'inline' | 'side-by-side'>[] = [
 ];
 
 export const AppearanceSettings: React.FC = () => {
+    const { isMobile } = useDeviceInfo();
     const showReasoningTraces = useUIStore(state => state.showReasoningTraces);
     const setShowReasoningTraces = useUIStore(state => state.setShowReasoningTraces);
     const toolCallExpansion = useUIStore(state => state.toolCallExpansion);
@@ -95,6 +97,7 @@ export const AppearanceSettings: React.FC = () => {
                 </div>
             )}
 
+            {!isMobile && (
                 <div className="space-y-4">
                     <div className="space-y-1">
                         <h3 className="typography-ui-header font-semibold text-foreground">
@@ -133,6 +136,7 @@ export const AppearanceSettings: React.FC = () => {
                         </ButtonSmall>
                     </div>
                 </div>
+            )}
 
             <div className="space-y-4">
                 <div className="space-y-1">
@@ -141,6 +145,37 @@ export const AppearanceSettings: React.FC = () => {
                     </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"
@@ -171,6 +206,7 @@ export const AppearanceSettings: React.FC = () => {
                             <RiRestartLine className="h-3.5 w-3.5" />
                         </ButtonSmall>
                     </div>
+                )}
             </div>
 
             <div className="space-y-4">
@@ -197,6 +233,7 @@ export const AppearanceSettings: React.FC = () => {
             </div>
 
             {}
+            {!isMobile && (
                 <div className="space-y-4">
                     <div className="space-y-1">
                         <h3 className="typography-ui-header font-semibold text-foreground">
@@ -225,6 +262,7 @@ export const AppearanceSettings: React.FC = () => {
                         </p>
                     </div>
                 </div>
+            )}
 
             {}
             <label className="flex items-center gap-2 cursor-pointer">

packages/ui/src/components/ui/MobileOverlayPanel.tsx

@@ -11,6 +11,7 @@ interface MobileOverlayPanelProps {
   children: React.ReactNode;
   footer?: React.ReactNode;
   className?: string;
+  contentMaxHeightClassName?: string;
   renderHeader?: (closeButton: React.ReactNode) => React.ReactNode;
 }
 
@@ -34,6 +35,7 @@ export const MobileOverlayPanel: React.FC<MobileOverlayPanelProps> = ({
   children,
   footer,
   className,
+  contentMaxHeightClassName,
   renderHeader,
 }) => {
   const overlayRootRef = React.useRef<HTMLElement | null>(null);
@@ -64,6 +66,8 @@ export const MobileOverlayPanel: React.FC<MobileOverlayPanelProps> = ({
     return null;
   }
 
+  const contentMaxHeight = contentMaxHeightClassName ?? 'max-h-[min(70vh,520px)]';
+
   const content = (
     <div
       className="fixed inset-0 z-50 flex flex-col bg-background/40 backdrop-blur-sm"
@@ -101,7 +105,7 @@ export const MobileOverlayPanel: React.FC<MobileOverlayPanelProps> = ({
             </div>
           );
         })()}
-        <ScrollableOverlay outerClassName="max-h-[min(70vh,520px)]" className="px-2 py-2 pwa-overlay-scroll">
+        <ScrollableOverlay outerClassName={contentMaxHeight} className="px-2 py-2 pwa-overlay-scroll">
           {children}
         </ScrollableOverlay>
         {footer ? (