b20c8cca39
Switches `listForUser` from page-offset to cursor (`before` param,
opaque base64 of `{ts, id}`) ordered by `(created_at DESC, id DESC)`
for stable pagination even with simultaneous fan-out inserts.
Returns `{ rows, nextCursor }` instead of a bare array. Loader surfaces
`?before=<cursor>` on a "Load older" link at the bottom of the list,
shown only while `nextCursor !== null`. Default page size 50, capped
at 100. Malformed cursors fall back to "start from top" rather than
400ing — opaque cursors should not be a client validation surface.
Spec drift: delta spec adds three pagination scenarios (cursor pages
forward, tie-stable on identical `created_at`, malformed-cursor
graceful fallback). Design doc gets a new decision section explaining
the cursor choice over page-offset and why we don't compute totals.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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