Pattern: Undo/Redo

Pattern: Undo / Redo

Build undo/redo functionality with a history stack state machine.

Undo/redo is a classic stack pattern that maps naturally to a state machine with history states and a stack context.

States: canUndo / canRedo / atHead / atTail

Stack as context with pointer

Guard: canUndo, canRedo

Actions: push, undo, redo, clear

Undo/Redo → Forms — Undoable form edits

Add bounded stack machine (max N entries)

Add group operations (atomic undo)

Add visual history timeline

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