perf(gui): Resolve massive frametime bloat by throttling telemetry and optimizing UI updates

tests/test_gui_performance_requirements.py

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+import pytest
+import time
+from api_hook_client import ApiHookClient
+
+def test_idle_performance_requirements():
+    """
+    Requirement: GUI must maintain < 16.6ms frametime on idle.
+    This test will fail if the performance is regressed.
+    """
+    client = ApiHookClient(base_url="http://127.0.0.1:8999")
+    
+    try:
+        # Get multiple samples to be sure
+        samples = []
+        for _ in range(5):
+            perf_data = client.get_performance()
+            samples.append(perf_data)
+            time.sleep(0.1)
+        
+        # Parse the JSON metrics
+        for sample in samples:
+            performance = sample.get('performance', {})
+            frame_time = performance.get('last_frame_time_ms', 0.0)
+            
+            # If frame_time is 0.0, it might mean the app just started and hasn't finished a frame yet
+            # or it's not actually running the main loop.
+            assert frame_time < 16.6, f"Frame time {frame_time}ms exceeds 16.6ms threshold"
+
+    except Exception as e:
+        pytest.fail(f"Failed to verify performance requirements: {e}")
+
+if __name__ == "__main__":
+    client = ApiHookClient(base_url="http://127.0.0.1:8999")
+    try:
+        perf = client.get_performance()
+        print(f"Current performance: {perf}")
+    except Exception as e:
+        print(f"App not running or error: {e}")