* feat: Add multi-select script download with progress tracking
- Add checkbox selection to script cards (both card and list views)
- Implement individual script downloads with real-time progress
- Add progress bar with visual indicators (✓ success, ✗ failed, ⟳ in-progress)
- Add batch download buttons (Download Selected, Download All Filtered)
- Add user-friendly error messages with specific guidance
- Add persistent progress bar with manual dismiss option
- Clear selection when switching between card/list views
- Update card download status immediately after completion
Features:
- Multi-select with checkboxes on script cards
- Real-time progress tracking during downloads
- Detailed error reporting with actionable messages
- Visual progress indicators for each script
- Batch download functionality for selected or filtered scripts
- Persistent progress bar until manually dismissed
- Automatic card status updates after download completion
* fix: Resolve ESLint errors
- Replace logical OR operators (||) with nullish coalescing (??) for safer null/undefined handling
- Replace for loop with for-of loop for better iteration
- Remove unused variable 'results'
- Fix all TypeScript ESLint warnings and errors
* fix: Resolve TypeScript error in loadMultipleScripts
- Use type guard to check for 'error' property before accessing
- Fix 'Property error does not exist' TypeScript error
- Ensure safe access to error property in result object
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