Add quick test runner and enhance run_tests script

- Introduced `quick_test.py` for running specific test categories (unit, integration, theme, all).
- Updated `run_tests.py` to improve test execution and reporting, including coverage.
- Removed outdated test scripts for keyboard shortcuts, menu theming, note saving, and entry updating.
- Added new test script `test_theme_changing.py` to verify theme changing functionality.
- Consolidated integration tests into `test_integration.py` for comprehensive testing of TheChart application.
- Updated theme manager to ensure color retrieval works correctly.
- Modified test constants to import from the correct module path.

scripts/test_theme_changing.py

@@ -0,0 +1,57 @@
+#!/usr/bin/env python3
+"""Test script to verify theme changing functionality works without errors."""
+
+import sys
+import tkinter as tk
+from pathlib import Path
+
+from init import logger
+from theme_manager import ThemeManager
+
+# Add src directory to Python path
+src_path = Path(__file__).parent.parent / "src"
+sys.path.insert(0, str(src_path))
+
+
+def test_theme_changes():
+    """Test changing between different themes to ensure no errors occur."""
+    print("Testing theme changing functionality...")
+
+    # Create a test tkinter window
+    root = tk.Tk()
+    root.withdraw()  # Hide the window
+
+    # Initialize theme manager
+    theme_manager = ThemeManager(root, logger)
+
+    # Test all available themes
+    available_themes = theme_manager.get_available_themes()
+    print(f"Available themes: {available_themes}")
+
+    for theme in available_themes:
+        print(f"Testing theme: {theme}")
+        try:
+            success = theme_manager.apply_theme(theme)
+            if success:
+                print(f"  ✓ {theme} applied successfully")
+
+                # Test getting theme colors (this is where the error was occurring)
+                colors = theme_manager.get_theme_colors()
+                print(f"  ✓ Theme colors retrieved: {list(colors.keys())}")
+
+                # Test getting menu colors
+                menu_colors = theme_manager.get_menu_colors()
+                print(f"  ✓ Menu colors retrieved: {list(menu_colors.keys())}")
+
+            else:
+                print(f"  ✗ Failed to apply {theme}")
+        except Exception as e:
+            print(f"  ✗ Error with {theme}: {e}")
+
+    # Clean up
+    root.destroy()
+    print("Theme testing completed!")
+
+
+if __name__ == "__main__":
+    test_theme_changes()