feat: add comprehensive logging for permission modal debugging

Added extensive logging to help diagnose permission modal issues:

Frontend:
- Capture unhandled errors via window.addEventListener('error')
- Capture unhandled promise rejections
- All errors now visible in debug console

Backend:
- Log when emitting permission events (count and conversation ID)
- Log each individual permission request being processed
- Log when system tools are skipped
- Log each denial being processed

This will help identify where the permission flow breaks in production builds.

src/lib/stores/debugConsole.ts

@@ -87,6 +87,20 @@ function createDebugConsoleStore() {
       originalConsole.debug(...args);
       addLog("debug", args.map((arg) => String(arg)).join(" "), "frontend");
     };
+
+    // Capture unhandled errors
+    window.addEventListener("error", (event) => {
+      addLog(
+        "error",
+        `[Unhandled Error] ${event.message} at ${event.filename}:${event.lineno}:${event.colno}`,
+        "frontend"
+      );
+    });
+
+    // Capture unhandled promise rejections
+    window.addEventListener("unhandledrejection", (event) => {
+      addLog("error", `[Unhandled Promise Rejection] ${event.reason}`, "frontend");
+    });
   }
 
   function restoreConsole() {