File Operations UI

Description

Implement UI for core file operations: copy, move, delete, rename. Integrates with backend jobs and shows progress.

Implementation Notes

• Use useLibraryMutation for all operations
• Show progress toast for long operations
• Subscribe to job progress events
• Handle errors gracefully with user feedback
• Confirmation dialogs for destructive operations

Acceptance Criteria

• Copy files via context menu or Cmd+C
• Move files via drag and drop
• Delete with confirmation dialog
• Rename with inline editing
• Duplicate files
• Create new folders
• Progress indicator for long operations
• Error handling with user-friendly messages
• Undo for safe operations