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

scripts/bundle-remotion.js

@@ -0,0 +1,50 @@
+/**
+ * Pre-build Remotion Bundle for Packaging
+ *
+ * This script runs BEFORE electron-forge packages the app.
+ * It pre-bundles the Remotion project so the packaged app
+ * doesn't need to call bundle() at runtime (which requires
+ * webpack and other heavy deps).
+ *
+ * Usage: node scripts/bundle-remotion.js
+ * Output: out/remotion-bundle/
+ */
+const path = require('path');
+const fs = require('fs');
+
+async function main() {
+  const outDir = path.join(__dirname, '..', 'out', 'remotion-bundle');
+
+  // Clean previous bundle
+  if (fs.existsSync(outDir)) {
+    fs.rmSync(outDir, { recursive: true });
+  }
+
+  console.log('📦 Building Remotion bundle for packaging...');
+  console.log('   Entry: src/Root.tsx');
+  console.log('   Output:', outDir);
+
+  const { bundle } = require('@remotion/bundler');
+  const entryPoint = path.join(__dirname, '..', 'src', 'Root.tsx');
+
+  const bundlePath = await bundle({
+    entryPoint,
+    outDir,
+    webpackOverride: (config) => config,
+  });
+
+  console.log('✅ Remotion bundle ready:', bundlePath);
+
+  // Verify the bundle exists
+  const indexPath = path.join(bundlePath, 'index.html');
+  if (!fs.existsSync(indexPath)) {
+    throw new Error(`Bundle verification failed: ${indexPath} not found`);
+  }
+
+  console.log('✅ Bundle verified (index.html exists)');
+}
+
+main().catch((err) => {
+  console.error('❌ Remotion bundle failed:', err);
+  process.exit(1);
+});