Refactor Windows build script for improved readability and consistency

- Cleaned up whitespace and formatting in build_windows.py for better readability.
- Consolidated environment variable setup for stdout and stderr.
- Streamlined subprocess command calls by removing unnecessary line breaks.
- Enhanced error handling and logging for better debugging.
- Updated comments for clarity and consistency.

Update updater.py to improve checksum verification logic

- Modified checksum verification to prioritize specific .sha256 files matching installer names.
- Added fallback logic to check for any .sha256 file if no specific match is found.

Enhance update manager UI with download progress dialog

- Introduced DownloadingDialog to provide feedback during update downloads.
- Updated MainWindow to manage the new downloading dialog and handle its lifecycle.
- Removed the skip version functionality from the update dialog as per new requirements.

Refactor update manager UI tests for clarity and maintainability

- Removed tests related to the skip version functionality.
- Updated test cases to reflect changes in the update manager UI.
- Ensured all tests are aligned with the new dialog structure and signal emissions.

src/webdrop_bridge/core/updater.py

@@ -330,10 +330,12 @@ class UpdateManager:
         Returns:
             True if checksum matches, False otherwise
         """
-        # Find .sha256 file in release assets
+        # Find .sha256 file matching the installer name (e.g. Setup.msi.sha256)
+        # Fall back to any .sha256 only if no specific match exists
+        installer_name = file_path.name
         checksum_asset = None
         for asset in release.assets:
-            if asset["name"].endswith(".sha256"):
+            if asset["name"] == f"{installer_name}.sha256":
                 checksum_asset = asset
                 break