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- Removed outdated test scripts for keyboard shortcuts, menu theming, note saving, and entry updating.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/quick_test.py

@@ -0,0 +1,89 @@
+#!/usr/bin/env python3
+"""
+Quick test runner for individual test categories.
+Usage:
+    python scripts/quick_test.py unit      # Run only unit tests
+    python scripts/quick_test.py integration  # Run only integration tests
+    python scripts/quick_test.py theme    # Test theme functionality
+    python scripts/quick_test.py all      # Run all tests (default)
+"""
+
+import subprocess
+import sys
+from pathlib import Path
+
+
+def run_unit_tests():
+    """Run unit tests only."""
+    cmd = [sys.executable, "-m", "pytest", "tests/", "--verbose", "-x", "--tb=short"]
+    return subprocess.run(cmd).returncode == 0
+
+
+def run_integration_tests():
+    """Run integration tests only."""
+    cmd = [
+        sys.executable,
+        "-m",
+        "pytest",
+        "tests/test_integration.py",
+        "--verbose",
+        "-s",
+    ]
+    return subprocess.run(cmd).returncode == 0
+
+
+def run_theme_tests():
+    """Run theme-related tests only."""
+    cmd = [
+        sys.executable,
+        "-m",
+        "pytest",
+        "tests/test_integration.py::TestIntegrationSuite::test_theme_changing_functionality",
+        "tests/test_integration.py::TestIntegrationSuite::test_menu_theming_integration",
+        "tests/test_theme_manager.py",
+        "--verbose",
+        "-s",
+    ]
+    return subprocess.run(cmd).returncode == 0
+
+
+def run_all_tests():
+    """Run the full test suite."""
+    return subprocess.run([sys.executable, "scripts/run_tests.py"]).returncode == 0
+
+
+def main():
+    """Main test runner."""
+    # Change to project root
+    project_root = Path(__file__).parent.parent
+    import os
+
+    os.chdir(project_root)
+
+    test_type = sys.argv[1] if len(sys.argv) > 1 else "all"
+
+    runners = {
+        "unit": run_unit_tests,
+        "integration": run_integration_tests,
+        "theme": run_theme_tests,
+        "all": run_all_tests,
+    }
+
+    if test_type not in runners:
+        print(f"Unknown test type: {test_type}")
+        print("Available options: unit, integration, theme, all")
+        sys.exit(1)
+
+    print(f"Running {test_type} tests...")
+    success = runners[test_type]()
+
+    if success:
+        print(f"✓ {test_type.title()} tests passed!")
+        sys.exit(0)
+    else:
+        print(f"✗ {test_type.title()} tests failed!")
+        sys.exit(1)
+
+
+if __name__ == "__main__":
+    main()