feat(missing-precedents): bridge cited-by-chair + decision number; open/closed tabs; single-line citation

Implements the chair-approved redesign of /missing-precedents (Claude Design
card 09). The "צוטט ע״י" and "תיק" columns were empty for ~98% of rows because
the corpus-decision reliance lives in precedent_internal_citations (keyed to
case_law), a different system than missing_precedents (keyed to cases).

Backend (G2 — read-time bridge, no stored duplication):
- list_missing_precedents: new cited_by_chairs / cited_by_decisions columns,
  resolved from the citation graph by normalized docket number (same
  normalization the relinker uses). For an open gap cited by committee
  decisions, surfaces the chair(s) (e.g. דפנה תמיר) + the deciding case numbers.

Frontend (matches approved mockup):
- "צוטט ע״י" shows the chair chip (bridge) with priority over the generic
  discovery-source chips; "תיק" shows the deciding decision number(s) + "+N".
- Status filter reduced to פתוח / נסגר (removed הועלה, לא-רלוונטי, הכל).
- "פסיקה" column collapses to a single line when case_name is empty — fixes the
  duplicated-citation two-row rendering.
- Lifecycle note simplified to open → closed.

Verified: bridge SQL returns chair+decisions on live data; tsc --noEmit clean;
py_compile clean.

Follow-up (data, separate): LLM backfill of legal_topic (נושא); create
missing_precedents rows for the 28 graph-cited rulings not yet tracked.

Invariants: G2 (single source of truth — bridge derived at read, no duplicated
column) · INV-AH context (closing source gaps).

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

web-ui/src/lib/api/missing-precedents.ts

@@ -56,6 +56,10 @@ export type MissingPrecedent = {
   discovery_source: string | null; // manual | cited_only | digest | court_fetch
   cited_by_precedents: string[] | null; // corpus precedents citing a cited_only stub
   yomon_number: string | null; // digest gap's source yomon number
+  // Bridge to the corpus citation graph: committee decisions (and their chairs)
+  // that cite this still-missing ruling — fills "צוטט ע״י <יו״ר>" + "תיק".
+  cited_by_chairs: string[] | null;
+  cited_by_decisions: string[] | null;
 };
 
 export type MissingPrecedentListResponse = {