feat(ui): Build Diagnostics Panel with real-time plots

tests/test_gui_diagnostics.py

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+import pytest
+from unittest.mock import patch, MagicMock
+import importlib.util
+import sys
+import dearpygui.dearpygui as dpg
+
+# Load gui.py as a module for testing
+spec = importlib.util.spec_from_file_location("gui", "gui.py")
+gui = importlib.util.module_from_spec(spec)
+sys.modules["gui"] = gui
+spec.loader.exec_module(gui)
+from gui import App
+
+@pytest.fixture
+def app_instance():
+    dpg.create_context()
+    with patch('dearpygui.dearpygui.create_viewport'), \
+         patch('dearpygui.dearpygui.setup_dearpygui'), \
+         patch('dearpygui.dearpygui.show_viewport'), \
+         patch('dearpygui.dearpygui.start_dearpygui'), \
+         patch('gui.load_config', return_value={}), \
+         patch.object(App, '_rebuild_files_list'), \
+         patch.object(App, '_rebuild_shots_list'), \
+         patch.object(App, '_rebuild_disc_list'), \
+         patch.object(App, '_rebuild_disc_roles_list'), \
+         patch.object(App, '_rebuild_discussion_selector'), \
+         patch.object(App, '_refresh_project_widgets'):
+        
+        app = App()
+        yield app
+    dpg.destroy_context()
+
+def test_diagnostics_panel_initialization(app_instance):
+    assert "Diagnostics" in app_instance.window_info
+    assert app_instance.window_info["Diagnostics"] == "win_diagnostics"
+    assert "frame_time" in app_instance.perf_history
+    assert len(app_instance.perf_history["frame_time"]) == 100
+
+def test_diagnostics_panel_updates(app_instance):
+    # Mock dependencies
+    mock_metrics = {
+        'last_frame_time_ms': 10.0,
+        'fps': 100.0,
+        'cpu_percent': 50.0,
+        'input_lag_ms': 5.0
+    }
+    app_instance.perf_monitor.get_metrics = MagicMock(return_value=mock_metrics)
+    
+    with patch('dearpygui.dearpygui.is_item_shown', return_value=True), \
+         patch('dearpygui.dearpygui.set_value') as mock_set_value, \
+         patch('dearpygui.dearpygui.configure_item') as mock_configure_item, \
+         patch('dearpygui.dearpygui.does_item_exist', return_value=True):
+        
+        # We also need to mock ai_client stats
+        with patch('ai_client.get_history_bleed_stats', return_value={}):
+            app_instance._update_telemetry_panel()
+            
+            # Verify UI updates
+            mock_set_value.assert_any_call("perf_fps_text", "100.0")
+            mock_set_value.assert_any_call("perf_frame_text", "10.0ms")
+            mock_set_value.assert_any_call("perf_cpu_text", "50.0%")
+            mock_set_value.assert_any_call("perf_lag_text", "5.0ms")
+            
+            # Verify history update
+            assert app_instance.perf_history["frame_time"][-1] == 10.0