- Add safety checks for window.openTTSModal and window.openTranslateModal availability
- Implement fallback dynamic imports if window functions not available
- Prevents "window.openTTSModal is not a function" and "window.openTranslateModal is not a function" errors
- Provides graceful error handling with user feedback if modal imports fail
- Resolves loading order dependency issues between ui.js and embed modal
This ensures modal buttons work regardless of script loading order.
