Refactor: extract business logic from components, clean composables
Tier 1 — Core API fixes:
- updateNodeWithUndo now calls requestRender internally, eliminating
15+ redundant requestRender() calls across 6 property panel components
- New editor/variables.ts: 7 undo-able variable CRUD operations
(renameCollection, addCollection, removeCollection, addVariable,
removeVariable, renameVariable, updateVariableValue)
- New editor/alignment.ts: alignNodes, flipNodes, rotateNodes —
moves bounding box geometry out of PositionSection.vue
Tier 2 — Composable cleanup:
- Merged use-node-props + use-multi-props into single useNodeProps()
with MIXED sentinel, eliminating duplicate computed refs
- Added toolCursor() utility — replaces if/else chain in EditorCanvas
- Renamed use-toast.ts → toast.ts (singleton module, not a composable)
Tier 3 — use-canvas-input.ts split (1497 → 817 lines):
- input/types.ts (88) — DragState variants, HandlePosition, TOOL_TO_NODE
- input/geometry.ts (170) — hit testing, handle positions, rotation cursor
- input/pan-zoom.ts (266) — wheel, touch pinch, Safari gestures
- input/resize.ts (121) — constrainToAspectRatio, applyResize
- input/auto-layout.ts (103) — insert indicator computation
All 955 tests pass, 0 lint errors, 1.48% duplication.
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