Undo/Redo Support (Ctrl+Z / Ctrl+Y)

[zubeyralmaho]

What:

Add undo/redo functionality with keyboard shortcuts (Ctrl+Z / Ctrl+Y).

Why:

Users need the ability to revert accidental changes and redo actions. This is a standard UX feature expected in any builder application.

How:

• Add history management to PropContext (past/future arrays)
• Implement undo() and redo() functions
• Add Ctrl+Z (undo) and Ctrl+Y (redo) keyboard shortcuts in useKeyboardActions

Checklist:

• Documentation added to the docs site
• Tests
• Ready to be merged

Related PR

#106