Many loading states rendered bare "Loading…" text with no spinner
element, and a couple rendered an unstyled `loading-spinner` div with no
matching CSS (invisible). The global spin animation was never broken —
it rotates in Chromium and WebKit — so prior transform-box edits chased
a non-bug, validated only by a string-matching CSS test.
Add a shared <LoadingSpinner> (self-contained animated SVG, no
lucide-react import so it survives partial test mocks) and adopt it
across ~47 loading placeholders so every loading state shows a
consistent animated spinner. Includes a component test that asserts the
svg carries the animate-spin utility.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
