feat: integrate Electron for desktop app

- Add electron-vite + Electron Forge tooling
- Create Electron main process with embedded Express server
- Create preload script with native dialog IPC bridge
- Refactor server.ts to export createExpressApp() (dual web/electron)
- Adapt renderQueue.ts for packaged binaries + pre-built bundle
- Add ensureBrowser() for Chrome Headless Shell pre-download
- Add scripts/bundle-remotion.js for packaging
- Data persists in ~/Library/Application Support/Bradly/
- Web mode preserved via npm run dev:web

forge.config.ts

@@ -0,0 +1,46 @@
+/**
+ * Electron Forge Configuration — Bradly Desktop App
+ *
+ * Handles packaging and creating distributable installers.
+ * Currently targets macOS (.dmg) only.
+ */
+import type { ForgeConfig } from '@electron-forge/shared-types';
+import { MakerDMG } from '@electron-forge/maker-dmg';
+
+const config: ForgeConfig = {
+  packagerConfig: {
+    name: 'Bradly',
+    executableName: 'bradly',
+    asar: {
+      // Remotion compositor binaries MUST be outside app.asar
+      // because they are native executables that need direct filesystem access
+      unpack: '{**/node_modules/@remotion/compositor-*/**,**/node_modules/@remotion/renderer/**}',
+    },
+    // Ignore development files during packaging
+    ignore: [
+      /^\/src$/,
+      /^\/scripts$/,
+      /^\/uploads$/,
+      /^\/renders$/,
+      /^\/\.vscode$/,
+      /^\/\.git$/,
+      /^\/\.env/,
+      /^\/\.antigravity$/,
+      /^\/vite\.config\.ts$/,
+      /^\/electron\.vite\.config\.ts$/,
+      /^\/tsconfig\.json$/,
+      /^\/ABOUT\.md$/,
+      /^\/AGENTS\.md$/,
+      /^\/README\.md$/,
+      /^\/schema\.sql$/,
+      /^\/backend_endpoint\.py$/,
+    ],
+  },
+  makers: [
+    new MakerDMG({
+      format: 'ULFO',
+    }),
+  ],
+};
+
+export default config;