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.

config.example.json

@@ -0,0 +1,22 @@
+{
+  "app_name": "WebDrop Bridge",
+  "webapp_url": "https://wps.agravity.io/",
+  "url_mappings": [
+    {
+      "url_prefix": "https://wpsagravitystg.file.core.windows.net/wpsagravitysync/",
+      "local_path": "Z:"
+    }
+  ],
+  "allowed_roots": [
+    "Z:\\"
+  ],
+  "allowed_urls": [],
+  "check_file_exists": true,
+  "auto_check_updates": true,
+  "update_check_interval_hours": 24,
+  "log_level": "INFO",
+  "log_file": "logs/webdrop_bridge.log",
+  "window_width": 1024,
+  "window_height": 768,
+  "enable_logging": true
+}