Three small UIUX fixes for the bundle drag-import surface.
1. Drag overlay was hardcoded blue-950/blue-400 — those tones don't
exist in the warm-paper light theme, so the overlay washed out
inconsistently. Switched to bg-accent/15 + border-accent/40 so
the overlay flips with theme and matches the inner card's
border-accent/50.
2. Importing spinner was visually obvious but invisible to screen
readers — only the result toast had aria-live. Operators relying
on AT had no way to know the import was in flight. Added
role="status" + aria-live="polite" + aria-hidden on the spinner
itself so the SR hears "Importing bundle..." once.
3. animate-spin → motion-safe:animate-spin so the spinner respects
prefers-reduced-motion (Tailwind's built-in variant gates the
animation on the user's OS setting). Layout doesn't change in
either case — text alone communicates state.
Also dropped border-sky-400 → border-accent on the spinner so it
matches the rest of the canvas semantics.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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