Undo redo functionality

[c5inco]

Implement comprehensive undo/redo functionality to allow users to revert and restore changes made to mesh points and canvas settings, addressing issue C5-40.

This PR introduces a snapshot-based UndoRedoManager to track state changes, enabling undo/redo for all major user actions including mesh point movements (optimized for drag operations), blur level, canvas dimensions, and color adjustments. Standard keyboard shortcuts (Ctrl/Cmd+Z, Ctrl/Cmd+Shift+Z, Ctrl+Y) are integrated for a familiar user experience.

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Linear Issue: C5-40

 

[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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