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-ui/src/components/missing-precedents/missing-precedents-table.tsx

@@ -141,7 +141,11 @@ export function MissingPrecedentsTable({ status, q, legalTopic }: Props) {
     status: status === "" ? undefined : status,
     q,
     legalTopic,
-    limit: 200,
+    // Load the full set so the accordion section counts (chair/digest/other)
+    // reflect the real totals — at limit:200 the page showed only the first
+    // page (e.g. 16 of 106 committee rows) while the header showed the true
+    // count, so the sections didn't sum to it. Backend caps at 2000.
+    limit: 1000,
   });
   const del = useDeleteMissingPrecedent();