Significant performance improvements to the 'Loading media...' phase:
- Reduced client-server round trips by consolidating the initial handshake (diagnostics + media fetch) into a single backend call: getMediaManagerInitialState.
- Implemented batched Google Drive metadata retrieval in GASDriveService using the Advanced Drive API, eliminating per-file property fetching calls.
- Switched to HtmlService templates in showMediaManager to pass initial SKU/Title data directly, enabling the UI shell to appear instantly upon opening.
- Updated documentation (ARCHITECTURE.md, MEMORY.md) to clarify Webpack global assignment requirements for GAS functions.
- Verified with comprehensive updates to unit and integration tests.
- Detect video mime types in MediaService to set correct resource ('VIDEO') and mediaContentType.
- Add fileSize to stagedUploadsCreate payload as required by Shopify for videos.
- Add safety check for missing upload targets to prevent crashes.
- Implement getSize in MockDriveService.
- Add unit test in MediaService.test.ts to verify correct resource and fileSize handling for video uploads.
- Update mock in mediaManager.integration.test.ts to support getSize().
- Backend (MediaService):
- Implemented robust contentUrl generation for Drive files using drive.google.com/uc pattern.
- Added mimeType exposure to unified media state.
- Frontend (MediaManager):
- Replaced video tag with iframe embedding the Google Drive Preview player (/preview) for reliable playback.
- Fixed syntax error in console logging causing UI freeze.
- Updated gallery card logic to prioritize video content URLs.
- Tests (Integration):
- Refactored mediaManager.integration.test.ts to align with new logic.
- Mocked DriveApp completely to support orphan adoption flows.
- Updated file renaming expectations to support timestamped filenames.
- Documentation:
- Updated MEMORY.md with video preview strategy.
