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.

tests/unit/test_updater.py

@@ -166,9 +166,7 @@ class TestCheckForUpdates:
 
     @pytest.mark.asyncio
     @patch.object(UpdateManager, "_fetch_release")
-    async def test_check_for_updates_no_update(
-        self, mock_fetch, update_manager
-    ):
+    async def test_check_for_updates_no_update(self, mock_fetch, update_manager):
         """Test no update available."""
         mock_fetch.return_value = {
             "tag_name": "v0.0.1",
@@ -184,9 +182,7 @@ class TestCheckForUpdates:
 
     @pytest.mark.asyncio
     @patch.object(UpdateManager, "_fetch_release")
-    async def test_check_for_updates_uses_cache(
-        self, mock_fetch, update_manager, sample_release
-    ):
+    async def test_check_for_updates_uses_cache(self, mock_fetch, update_manager, sample_release):
         """Test cache is used on subsequent calls."""
         mock_fetch.return_value = sample_release
 
@@ -207,9 +203,7 @@ class TestDownloading:
     """Test update downloading."""
 
     @pytest.mark.asyncio
-    async def test_download_update_success(
-        self, update_manager, tmp_path
-    ):
+    async def test_download_update_success(self, update_manager, tmp_path):
         """Test successful update download."""
         # Create release with .msi asset
         release_data = {
@@ -237,9 +231,7 @@ class TestDownloading:
 
     @pytest.mark.asyncio
     @patch.object(UpdateManager, "_download_file")
-    async def test_download_update_no_installer(
-        self, mock_download, update_manager
-    ):
+    async def test_download_update_no_installer(self, mock_download, update_manager):
         """Test download fails when no installer in release."""
         release_data = {
             "tag_name": "v0.0.2",
@@ -270,8 +262,8 @@ class TestChecksumVerification:
         self, mock_download_checksum, update_manager, sample_release, tmp_path
     ):
         """Test successful checksum verification."""
-        # Create test file
-        test_file = tmp_path / "test.exe"
+        # File must match the asset name so the .sha256 lookup succeeds
+        test_file = tmp_path / "WebDropBridge.exe"
         test_file.write_bytes(b"test content")
 
         # Calculate actual checksum
@@ -291,7 +283,8 @@ class TestChecksumVerification:
         self, mock_download_checksum, update_manager, sample_release, tmp_path
     ):
         """Test checksum verification fails on mismatch."""
-        test_file = tmp_path / "test.exe"
+        # File must match the asset name so the .sha256 lookup succeeds
+        test_file = tmp_path / "WebDropBridge.exe"
         test_file.write_bytes(b"test content")
 
         # Return wrong checksum
@@ -303,9 +296,7 @@ class TestChecksumVerification:
         assert result is False
 
     @pytest.mark.asyncio
-    async def test_verify_checksum_no_checksum_file(
-        self, update_manager, tmp_path
-    ):
+    async def test_verify_checksum_no_checksum_file(self, update_manager, tmp_path):
         """Test verification skipped when no checksum file in release."""
         test_file = tmp_path / "test.exe"
         test_file.write_bytes(b"test content")
@@ -336,9 +327,7 @@ class TestInstallation:
 
     @patch("subprocess.Popen")
     @patch("platform.system")
-    def test_install_update_windows(
-        self, mock_platform, mock_popen, update_manager, tmp_path
-    ):
+    def test_install_update_windows(self, mock_platform, mock_popen, update_manager, tmp_path):
         """Test installation on Windows."""
         mock_platform.return_value = "Windows"
         installer = tmp_path / "WebDropBridge.msi"
@@ -351,9 +340,7 @@ class TestInstallation:
 
     @patch("subprocess.Popen")
     @patch("platform.system")
-    def test_install_update_macos(
-        self, mock_platform, mock_popen, update_manager, tmp_path
-    ):
+    def test_install_update_macos(self, mock_platform, mock_popen, update_manager, tmp_path):
         """Test installation on macOS."""
         mock_platform.return_value = "Darwin"
         installer = tmp_path / "WebDropBridge.dmg"