Refactor drag handling and update tests

- Renamed `initiate_drag` to `handle_drag` in MainWindow and updated related tests.
- Improved drag handling logic to utilize a bridge for starting file drags.
- Updated `_on_drag_started` and `_on_drag_failed` methods to match new signatures.
- Modified test cases to reflect changes in drag handling and assertions.

Enhance path validation and logging

- Updated `PathValidator` to log warnings for nonexistent roots instead of raising errors.
- Adjusted tests to verify the new behavior of skipping nonexistent roots.

Update web application UI and functionality

- Changed displayed text for drag items to reflect local paths and Azure Blob Storage URLs.
- Added debug logging for drag operations in the web application.
- Improved instructions for testing drag and drop functionality.

Add configuration documentation and example files

- Created `CONFIG_README.md` to provide detailed configuration instructions for WebDrop Bridge.
- Added `config.example.json` and `config_test.json` for reference and testing purposes.

Implement URL conversion logic

- Introduced `URLConverter` class to handle conversion of Azure Blob Storage URLs to local paths.
- Added unit tests for URL conversion to ensure correct functionality.

Develop download interceptor script

- Created `download_interceptor.js` to intercept download-related actions in the web application.
- Implemented logging for fetch calls, XMLHttpRequests, and Blob URL creations.

Add download test page and related tests

- Created `test_download.html` for testing various download scenarios.
- Implemented `test_download.py` to verify download path resolution and file construction.
- Added `test_url_mappings.py` to ensure URL mappings are loaded correctly.

Add unit tests for URL converter

- Created `test_url_converter.py` to validate URL conversion logic and mapping behavior.

tests/unit/test_config.py

@@ -98,12 +98,13 @@ class TestConfigFromEnv:
             Config.from_env(str(env_file))
 
     def test_from_env_invalid_root_path(self, tmp_path):
-        """Test that non-existent root paths raise ConfigurationError."""
+        """Test that non-existent root paths are logged as warning but don't raise error."""
         env_file = tmp_path / ".env"
         env_file.write_text("ALLOWED_ROOTS=/nonexistent/path/that/does/not/exist\n")
 
-        with pytest.raises(ConfigurationError, match="does not exist"):
-            Config.from_env(str(env_file))
+        # Should not raise - just logs warning and returns empty allowed_roots
+        config = Config.from_env(str(env_file))
+        assert config.allowed_roots == []  # Non-existent roots are skipped
 
     def test_from_env_empty_webapp_url(self, tmp_path):
         """Test that empty webapp URL raises ConfigurationError."""