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/lib/persistence.ts

@@ -130,6 +130,23 @@ const sanitizeProjects = (value: unknown): DesktopSettings['projects'] | undefin
     ) {
       project.lastOpenedAt = candidate.lastOpenedAt;
     }
+    // Preserve worktreeDefaults
+    if (candidate.worktreeDefaults && typeof candidate.worktreeDefaults === 'object') {
+      const wt = candidate.worktreeDefaults as Record<string, unknown>;
+      const defaults: Record<string, unknown> = {};
+      if (typeof wt.branchPrefix === 'string' && wt.branchPrefix.trim()) {
+        defaults.branchPrefix = wt.branchPrefix.trim();
+      }
+      if (typeof wt.baseBranch === 'string' && wt.baseBranch.trim()) {
+        defaults.baseBranch = wt.baseBranch.trim();
+      }
+      if (typeof wt.autoCreateWorktree === 'boolean') {
+        defaults.autoCreateWorktree = wt.autoCreateWorktree;
+      }
+      if (Object.keys(defaults).length > 0) {
+        (project as unknown as Record<string, unknown>).worktreeDefaults = defaults;
+      }
+    }
 
     result.push(project);
   }