The six loading states across the Knowledge wiki (initial app load, the
reader's note/history fetches, and the four Cleanup tabs) all showed a
centered spinner with no relation to what was about to render — costing
a full reflow the instant real content landed. Replaces each with a
skeleton shaped like its actual content (tree rows, reader header +
prose, revision list + diff, cluster cards, table rows, flat lists)
using the existing shadcn Skeleton primitive already used elsewhere.
Verified each of the six by temporarily injecting a delay into
fetchWithAuth and screenshotting the transient state.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
dtoro
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