remove-auth-from-electron-react-applisted

When removing a cross-cutting concern like Firebase authentication + cloud sync from an Electron + React app, the dependency spans three architectural layers that must each be addressed: 1. **Renderer process** (React): services, stores, components, pages 2. **Main process** (Electron): IPC handlers, CSP headers, `BrowserWindow` popup/open handlers, navigation allow-lists 3. **Preload bridge**: `contextBridge.exposeInMainWorld` entries that expose auth IPC to the renderer **Why:** Deleting just the Firebase service file (`firebase.js`) leaves dangling imports in stores (Zustand), UI components (header, settings), layout init calls, and IPC handlers in the Electron main process. The app will crash at import-time or fail silently with broken UI. Each layer must be traced and cleaned. **How to apply:** ### Step 1 — Map all touchpoints with grep ```bash grep -r "firebase\|googleSignIn\|authStore\|onAuthChange" src/ electron/ ``` ### Step 2 — Clean renderer layer (top-down) - **Service file** (`src/services/firebase.js`): delete entirely - **Auth store** (`src/store/authStore.js`): delete entirely (Zustand store that wraps Firebase auth) - **Stores that call Firebase** (e.g. `clipboardStore.js`): remove imports (`auth`, `syncClipToCloud`, `deleteClipFromCloud`), remove helper (`getCloudUser`), remove cloud-sync blocks inside `addItem`/`updateItem`/`deleteItem` - **Layout components** (`Layout.jsx`, `MobileLayout.jsx`): remove `useAuthStore` import, `initAuth()` call, and u