a11y: keyboard-operable editor chrome + topbar aria-labels
Clickable <div> rows/tiles (page list, layer tree, template cards, asset
picker grid) now expose role="button", a tab stop, and Enter/Space
activation via a shared clickableProps() helper, matching their existing
onClick behavior. TopBar icon-only controls (device switcher, undo/redo,
save, publish, templates, code, preview, back) gain aria-label alongside
their existing title tooltips.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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