feat: implement worktree session creation and management

- Added `createWorktreeSession` utility to handle the creation of new sessions with auto-generated worktrees.
- Introduced branch name generation utilities for creating unique and friendly branch names.
- Updated `CommandPalette` to trigger worktree session creation via a command.
- Refactored keyboard shortcuts to support new worktree session creation with Shift + Cmd/Ctrl + N.
- Enhanced project settings to include worktree defaults (branch prefix, base branch, auto-create option).
- Updated persistence logic to preserve worktree defaults when saving project settings.
- Modified menu actions to initiate new worktree sessions.
- Ensured proper handling of existing branches to avoid conflicts during worktree creation.

packages/ui/src/hooks/useKeyboardShortcuts.ts

@@ -5,6 +5,7 @@ import { useThemeSystem } from '@/contexts/useThemeSystem';
 import { useAssistantStatus } from '@/hooks/useAssistantStatus';
 import { getRegisteredRuntimeAPIs } from '@/contexts/runtimeAPIRegistry';
 import { hasModifier } from '@/lib/utils';
+import { createWorktreeSession } from '@/lib/worktreeSessionCreator';
 
 export const useKeyboardShortcuts = () => {
   const { openNewSessionDraft, abortCurrentOperation, armAbortPrompt, clearAbortPrompt, currentSessionId } = useSessionStore();
@@ -13,7 +14,6 @@ export const useKeyboardShortcuts = () => {
     toggleHelpDialog,
     toggleSidebar,
     setSessionSwitcherOpen,
-    setSessionCreateDialogOpen,
     setActiveMainTab,
     setSettingsDialogOpen,
     setModelSelectorOpen,
@@ -82,10 +82,13 @@ export const useKeyboardShortcuts = () => {
       if (hasModifier(e) && e.key.toLowerCase() === 'n') {
         e.preventDefault();
         if (e.shiftKey) {
-          setSessionCreateDialogOpen(true);
+          // Shift+Cmd/Ctrl+N creates a new session with auto-generated worktree
+          setActiveMainTab('chat');
+          setSessionSwitcherOpen(false);
+          createWorktreeSession();
           return;
         }
-
+        // Cmd/Ctrl+N opens a new session without worktree
         setActiveMainTab('chat');
         setSessionSwitcherOpen(false);
         openNewSessionDraft();
@@ -138,7 +141,6 @@ export const useKeyboardShortcuts = () => {
           isCommandPaletteOpen,
           isHelpDialogOpen,
           isSessionSwitcherOpen,
-          isSessionCreateDialogOpen,
           isAboutDialogOpen,
           activeMainTab,
           isModelSelectorOpen,
@@ -150,7 +152,7 @@ export const useKeyboardShortcuts = () => {
         }
 
         // Skip if any overlay open or not on chat tab
-        const hasOverlay = isCommandPaletteOpen || isHelpDialogOpen || isSessionSwitcherOpen || isSessionCreateDialogOpen || isAboutDialogOpen;
+        const hasOverlay = isCommandPaletteOpen || isHelpDialogOpen || isSessionSwitcherOpen || isAboutDialogOpen;
         const isChatActive = activeMainTab === 'chat';
 
         if (hasOverlay || !isChatActive) {
@@ -168,7 +170,6 @@ export const useKeyboardShortcuts = () => {
           isCommandPaletteOpen,
           isHelpDialogOpen,
           isSessionSwitcherOpen,
-          isSessionCreateDialogOpen,
           isAboutDialogOpen,
           activeMainTab,
         } = useUIStore.getState();
@@ -182,7 +183,7 @@ export const useKeyboardShortcuts = () => {
         }
 
         // Check if any overlay is open or not on chat tab - don't process abort
-        const hasOverlay = isCommandPaletteOpen || isHelpDialogOpen || isSessionSwitcherOpen || isSessionCreateDialogOpen || isAboutDialogOpen;
+        const hasOverlay = isCommandPaletteOpen || isHelpDialogOpen || isSessionSwitcherOpen || isAboutDialogOpen;
         const isChatActive = activeMainTab === 'chat';
 
         if (hasOverlay || !isChatActive) {
@@ -238,7 +239,6 @@ export const useKeyboardShortcuts = () => {
     toggleHelpDialog,
     toggleSidebar,
     setSessionSwitcherOpen,
-    setSessionCreateDialogOpen,
     setActiveMainTab,
     setSettingsDialogOpen,
     setModelSelectorOpen,

packages/ui/src/hooks/useMenuActions.ts

@@ -8,6 +8,7 @@ import { getRegisteredRuntimeAPIs } from '@/contexts/runtimeAPIRegistry';
 import { sessionEvents } from '@/lib/sessionEvents';
 import { isDesktopRuntime } from '@/lib/desktop';
 import { useFileSystemAccess } from '@/hooks/useFileSystemAccess';
+import { createWorktreeSession } from '@/lib/worktreeSessionCreator';
 
 const MENU_ACTION_EVENT = 'openchamber:menu-action';
 
@@ -16,7 +17,7 @@ type MenuAction =
   | 'settings'
   | 'command-palette'
   | 'new-session'
-  | 'worktree-creator'
+  | 'new-worktree-session'
   | 'change-workspace'
   | 'open-git-tab'
   | 'open-diff-tab'
@@ -38,7 +39,6 @@ export const useMenuActions = (
     toggleHelpDialog,
     toggleSidebar,
     setSessionSwitcherOpen,
-    setSessionCreateDialogOpen,
     setActiveMainTab,
     setSettingsDialogOpen,
     setAboutDialogOpen,
@@ -108,8 +108,10 @@ export const useMenuActions = (
           openNewSessionDraft();
           break;
 
-        case 'worktree-creator':
-          setSessionCreateDialogOpen(true);
+        case 'new-worktree-session':
+          setActiveMainTab('chat');
+          setSessionSwitcherOpen(false);
+          createWorktreeSession();
           break;
 
         case 'change-workspace':
@@ -202,7 +204,6 @@ export const useMenuActions = (
     toggleHelpDialog,
     toggleSidebar,
     setSessionSwitcherOpen,
-    setSessionCreateDialogOpen,
     setActiveMainTab,
     setSettingsDialogOpen,
     setAboutDialogOpen,