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.

test_download.py

@@ -0,0 +1,19 @@
+"""Test script to verify download functionality."""
+
+import sys
+from pathlib import Path
+
+from PySide6.QtCore import QStandardPaths, QUrl
+from PySide6.QtWebEngineCore import QWebEngineDownloadRequest
+from PySide6.QtWidgets import QApplication
+
+# Test download path resolution
+downloads_path = QStandardPaths.writableLocation(QStandardPaths.StandardLocation.DownloadLocation)
+print(f"Downloads folder: {downloads_path}")
+print(f"Downloads exists: {Path(downloads_path).exists()}")
+
+# Test file path construction
+test_filename = "test_file.pdf"
+download_file = Path(downloads_path) / test_filename
+print(f"Test download path: {download_file}")
+print(f"Parent exists: {download_file.parent.exists()}")