feat: CodePilot - desktop GUI for Claude Code

Full-featured desktop application built with Next.js + Electron:
- Streaming chat with Claude Code via Agent SDK
- Session management with SQLite persistence
- Project file tree and file preview
- MCP server and custom skills management
- Permission controls with Code/Plan/Ask modes
- Dark/light theme, token tracking
- macOS DMG packaging with electron-builder

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/build-electron.mjs

@@ -0,0 +1,31 @@
+import { build } from 'esbuild';
+
+async function buildElectron() {
+  const shared = {
+    bundle: true,
+    platform: 'node',
+    target: 'node18',
+    external: ['electron'],
+    sourcemap: true,
+    minify: false,
+  };
+
+  await build({
+    ...shared,
+    entryPoints: ['electron/main.ts'],
+    outfile: 'dist-electron/main.js',
+  });
+
+  await build({
+    ...shared,
+    entryPoints: ['electron/preload.ts'],
+    outfile: 'dist-electron/preload.js',
+  });
+
+  console.log('Electron build complete');
+}
+
+buildElectron().catch((err) => {
+  console.error(err);
+  process.exit(1);
+});