refactor: migrate to monorepo structure with Docker, PocketBase, and e2e tests

- Reorganize into apps/, packages/, docs/, e2e/, pocketbase/ directories
- Add Dockerfiles for web, worker, and PocketBase services
- Add docker-compose.yml for local orchestration
- Add turbo.json for monorepo task management
- Add Playwright e2e test infrastructure
- Add PocketBase backend with migrations
- Remove Vite/Next.js/ESLint/PostCSS config files
- Update package.json with workspace dependencies
- Add .env.example and .dockerignore

apps/web/lib/stores/use-sidebar-store.ts

@@ -0,0 +1,28 @@
+import { create } from 'zustand';
+import { persist } from 'zustand/middleware';
+
+interface SidebarState {
+  collapsed: boolean;
+  mobileOpen: boolean;
+
+  // Actions
+  toggle: () => void;
+  setCollapsed: (collapsed: boolean) => void;
+  setMobileOpen: (open: boolean) => void;
+}
+
+export const useSidebarStore = create<SidebarState>()(
+  persist(
+    (set) => ({
+      collapsed: false,
+      mobileOpen: false,
+
+      toggle: () => set((state) => ({ collapsed: !state.collapsed })),
+      setCollapsed: (collapsed) => set({ collapsed }),
+      setMobileOpen: (mobileOpen) => set({ mobileOpen }),
+    }),
+    {
+      name: 'project-e-sidebar',
+    }
+  )
+);