74Implement undo/redo history for a React state editor

Implement useHistory(initialPresent, { limit = 100 } = {}), a hook that works like useState but remembers previous values. It returns:

{ state, set, undo, redo, reset, canUndo, canRedo }

• set(value) (or set(previous => next)) records a new state. It clears the redo stack.
• undo() goes back one step; redo() goes forward one step. Both do nothing when there is nothing to undo or redo.
• reset(value) starts a fresh history with value as the present.
• Setting a value that is identical (Object.is) to the present does not add a history entry.
• Keep at most limit past states; drop the oldest beyond that.

Then use it in an Editor component: a <textarea> with Undo and Redo buttons, and keyboard shortcuts Ctrl/⌘+Z (undo) and Ctrl/⌘+Shift+Z (redo).