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/stores/useProjectsStore.ts

@@ -1,7 +1,7 @@
 import { create } from 'zustand';
 import { devtools } from 'zustand/middleware';
 import { opencodeClient } from '@/lib/opencode/client';
-import type { ProjectEntry } from '@/lib/api/types';
+import type { ProjectEntry, WorktreeDefaults } from '@/lib/api/types';
 import type { DesktopSettings } from '@/lib/desktop';
 import { updateDesktopSettings } from '@/lib/persistence';
 import { getSafeStorage } from './utils/safeStorage';
@@ -27,6 +27,7 @@ interface ProjectsStore {
   validateProjectPath: (path: string) => ProjectPathValidationResult;
   synchronizeFromSettings: (settings: DesktopSettings) => void;
   getActiveProject: () => ProjectEntry | null;
+  updateWorktreeDefaults: (projectId: string, defaults: Partial<WorktreeDefaults>) => void;
 }
 
 const safeStorage = getSafeStorage();
@@ -120,6 +121,22 @@ const sanitizeProjects = (value: unknown): ProjectEntry[] => {
     if (typeof candidate.lastOpenedAt === 'number' && Number.isFinite(candidate.lastOpenedAt) && candidate.lastOpenedAt >= 0) {
       project.lastOpenedAt = candidate.lastOpenedAt;
     }
+    if (candidate.worktreeDefaults && typeof candidate.worktreeDefaults === 'object') {
+      const wt = candidate.worktreeDefaults as Record<string, unknown>;
+      const defaults: WorktreeDefaults = {};
+      if (typeof wt.branchPrefix === 'string') {
+        defaults.branchPrefix = wt.branchPrefix;
+      }
+      if (typeof wt.baseBranch === 'string') {
+        defaults.baseBranch = wt.baseBranch;
+      }
+      if (typeof wt.autoCreateWorktree === 'boolean') {
+        defaults.autoCreateWorktree = wt.autoCreateWorktree;
+      }
+      if (Object.keys(defaults).length > 0) {
+        project.worktreeDefaults = defaults;
+      }
+    }
 
     result.push(project);
   }
@@ -434,6 +451,45 @@ export const useProjectsStore = create<ProjectsStore>()(
       }
       return projects.find((project) => project.id === activeProjectId) ?? null;
     },
+
+    updateWorktreeDefaults: (projectId: string, defaults: Partial<WorktreeDefaults>) => {
+      if (vscodeWorkspace) {
+        return;
+      }
+      const { projects, activeProjectId } = get();
+      const target = projects.find((project) => project.id === projectId);
+      if (!target) {
+        return;
+      }
+
+      const merged: WorktreeDefaults = { ...target.worktreeDefaults };
+      if (defaults.branchPrefix !== undefined) {
+        if (defaults.branchPrefix.trim()) {
+          merged.branchPrefix = defaults.branchPrefix.trim();
+        } else {
+          delete merged.branchPrefix;
+        }
+      }
+      if (defaults.baseBranch !== undefined) {
+        if (defaults.baseBranch.trim()) {
+          merged.baseBranch = defaults.baseBranch.trim();
+        } else {
+          delete merged.baseBranch;
+        }
+      }
+      if (defaults.autoCreateWorktree !== undefined) {
+        merged.autoCreateWorktree = defaults.autoCreateWorktree;
+      }
+
+      const nextProjects = projects.map((project) =>
+        project.id === projectId
+          ? { ...project, worktreeDefaults: Object.keys(merged).length > 0 ? merged : undefined }
+          : project
+      );
+
+      set({ projects: nextProjects });
+      persistProjects(nextProjects, activeProjectId);
+    },
   }), { name: 'projects-store' })
 );