🤖 Fix main process freeze: Make React DevTools non-blocking

PROBLEM: React DevTools installation is awaited in app.whenReady(),
blocking the main process for several seconds before window creation.
User experiences macOS spinning cursor and frozen UI immediately on
'bun start'.

Timeline (blocking):
  App ready → await installExtension (8s) → createMenu → createWindow

SOLUTION: Don't await React DevTools installation. Let it install in
background while app continues startup.

Timeline (non-blocking):
  App ready → installExtension (background) + createMenu + createWindow

IMPACT:
- Main process no longer blocks on DevTools installation
- Window appears immediately
- DevTools still installs, just doesn't block startup

Author: ammar-agent

src/main.ts

@@ -363,18 +363,20 @@ function createWindow() {
 if (gotTheLock) {
   void app.whenReady().then(async () => {
     try {
-      console.log("App ready, creating window...");
+      console.log(`[${timestamp()}] App ready, creating window...`);
 
-      // Install React DevTools in development
+      // Install React DevTools in development (non-blocking)
+      // Don't await - let it install in background while app starts
       if (!app.isPackaged && installExtension && REACT_DEVELOPER_TOOLS) {
-        try {
-          const extension = await installExtension(REACT_DEVELOPER_TOOLS, {
-            loadExtensionOptions: { allowFileAccess: true },
+        void installExtension(REACT_DEVELOPER_TOOLS, {
+          loadExtensionOptions: { allowFileAccess: true },
+        })
+          .then((extension) => {
+            console.log(`[${timestamp()}] React DevTools installed: ${extension.name}`);
+          })
+          .catch((err) => {
+            console.log(`[${timestamp()}] React DevTools install failed:`, err);
           });
-          console.log(`✅ React DevTools installed: ${extension.name} (id: ${extension.id})`);
-        } catch (err) {
-          console.log("❌ Error installing React DevTools:", err);
-        }
       }
 
       createMenu();