fix(missing-precedents): load full set so accordion counts match the header

The table fetched limit:200 while the header shows the true open count (~497,
via a separate COUNT). With accordion grouping this became visible: sections
summed to exactly 200 (e.g. 16 chair / 173 digest / 11 other) — and 90 of the
106 committee rows (the high-value "cited by Dafna" ones) were hidden past row
200. True buckets: chair 106 / digest 328 / other 63.

- web-ui: list limit 200 → 1000 so all open rows load; accordion section counts
  (computed from the loaded set) now equal the header total.
- backend: list cap 500 → 2000 to allow it (response stays a few hundred KB).

Logic/data only — no visual change (bug-fix exception to the design gate).
tsc --noEmit clean; py_compile clean.

Follow-up: when the backlog (digests grow daily) approaches the cap, move to
server-side per-bucket counts + pagination/virtualization (design gate).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web/app.py

@@ -7877,7 +7877,7 @@ async def missing_precedents_list(
         case_id=case_uuid,
         legal_topic=legal_topic.strip() or None,
         q=q.strip() or None,
-        limit=max(1, min(int(limit), 500)),
+        limit=max(1, min(int(limit), 2000)),
         offset=max(0, int(offset)),
     )
     # Counters useful for the sidebar badge.