Migrate React → Vue 3 + VueUse + Reka UI
- Vue 3 SFC components with <script setup>
- Reactive store (Vue reactivity) replacing React refs/state
- Composables: useCanvas, useCanvasInput, useKeyboard
- Components: EditorCanvas, LayersPanel, PropertiesPanel, Toolbar
- Floating toolbar (Figma UI3 style) with pill shape + shadow
- Properties panel with Design/Prototype tabs + zoom display
- Sections: Position, Rotation, Layout, Appearance, Fill, Stroke, Effects, Export
- CSS custom properties for theming (--panel-bg, --border, --accent, etc.)
- Add Figma UI3 CDP inspection findings (toolbar, panels, sections)
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