feat(perf): Integrate PerformanceMonitor with DPG main loop

gui.py

@@ -26,6 +26,7 @@ import session_logger
 import project_manager
 import api_hooks
 import theme
+from performance_monitor import PerformanceMonitor
 
 CONFIG_PATH = Path("config.toml")
 PROVIDERS = ["gemini", "anthropic"]
@@ -493,6 +494,8 @@ class App:
         self._is_script_blinking = False
         self._script_blink_start_time = 0.0
 
+        self.perf_monitor = PerformanceMonitor()
+
         session_logger.open_session()
         ai_client.set_provider(self.current_provider, self.current_model)
         ai_client.confirm_and_run_callback = self._confirm_and_run
@@ -2108,6 +2111,7 @@ class App:
         self.hook_server.start()
 
         while dpg.is_dearpygui_running():
+            self.perf_monitor.start_frame()
             # Show any pending confirmation dialog on the main thread safely
             with self._pending_dialog_lock:
                 dialog = self._pending_dialog
@@ -2244,6 +2248,7 @@ class App:
             self._flush_pending_comms()
             self._update_telemetry_panel()
 
+            self.perf_monitor.end_frame()
             dpg.render_dearpygui_frame()
 
         # Save everything on exit
@@ -2254,6 +2259,7 @@ class App:
 
         dpg.save_init_file("dpg_layout.ini")
         session_logger.close_session()
+        self.perf_monitor.stop()
         ai_client.cleanup()  # Destroy active API caches to stop billing
         self.hook_server.stop()
         dpg.destroy_context()