feat(timeline): add Ctrl+X cut shortcut for timeline elements

[nino-chavez]

Summary

• Added Ctrl+X keybinding for cut functionality (copy + delete)
• New "cut-selected" action that copies selected elements to clipboard then deletes them
• Added keyboard shortcut help entry

Related Issue

Partially addresses #672

Note on Drag/Drop Between Tracks

After investigating the codebase, cross-track drag/drop is already implemented:

• moveElementToTrack() function exists in timeline-store.ts
• Used in timeline-track.tsx for drag operations
• Elements can be dragged from one track to another

If drag/drop between tracks isn't working for some users, it may be:

1. A browser-specific issue
2. A regression in a specific version
3. User may not be aware of the feature

Would appreciate confirmation from maintainers on whether additional work is needed for cross-track drag/drop.

Test plan

• Select element on timeline
• Press Ctrl+X (or Cmd+X on Mac)
• Element is copied to clipboard AND deleted
• Ctrl+V pastes the element at playhead position
• Keyboard shortcuts help shows new shortcut

🤖 Generated with Claude Code

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🔨 Latest commit	1807a11

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