UI-facing half of the undo/redo feature. Combined with the previous two
commits, Ctrl+Z (or the toolbar button) now reverses every canvas
mutation: add/remove component, move, rotate, set property, add/remove
wire.
EditorPage.tsx:
- New window-keydown effect for Ctrl+Z / Ctrl+Y / Ctrl+Shift+Z (and the
Cmd equivalents). Uses the same input/textarea/contenteditable guard
as the existing Ctrl+S handler — Monaco's per-file undo and the AI
chat composer keep their own behaviour.
SimulatorCanvas.tsx:
- Two icon buttons (undo + redo) added to the canvas header, between
the board selector and the Serial Monitor toggle. Tooltip surfaces
the next command's description ("Undo: Add LED (Ctrl+Z)") so the
user knows exactly what's about to revert. Buttons disable when the
stack is empty in that direction.
- New `canvas-icon-btn` CSS class for square 32×32 icon-only buttons
(matches the visual weight of the existing Serial button without
the label).
- Subscribes to history / historyIndex via store selectors so the
buttons re-render reactively as commands are pushed/undone.
No new tests — the store-level coverage from 99ed22b already exercises
undo/redo round trips. UI affordances are wired pass-through to those
store APIs.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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