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>

mcp-server/src/legal_mcp/services/db.py

@@ -7915,7 +7915,33 @@ _MP_PROVENANCE_COLS = """,
                   WHERE pic.cited_case_law_id = mp.linked_case_law_id
                     AND COALESCE(src.case_number, '') <> ''
                ) AS cited_by_precedents,
-               substring(mp.notes from 'מס''?\\s*([0-9]+)') AS yomon_number"""
+               substring(mp.notes from 'מס''?\\s*([0-9]+)') AS yomon_number,
+               -- Bridge to the corpus citation graph (G2: read-time, no stored
+               -- duplication). For an OPEN gap (no linked_case_law_id yet) find
+               -- which committee DECISIONS cite this ruling, matched on the
+               -- normalized docket number (same normalization the relinker uses:
+               -- strip to digits/dashes, slash->dash). Surfaces "צוטט ע\"י <יו\"ר>"
+               -- + the deciding case number in the UI.
+               (SELECT array_agg(DISTINCT src.chair_name ORDER BY src.chair_name)
+                  FROM precedent_internal_citations picc
+                  JOIN case_law src ON src.id = picc.source_case_law_id
+                       AND src.source_kind = 'internal_committee'
+                  WHERE split_part(mp.citation_norm, '|', 2) <> ''
+                    AND regexp_replace(replace(picc.cited_case_number, '/', '-'),
+                                       '[^0-9-]', '', 'g')
+                        = split_part(mp.citation_norm, '|', 2)
+                    AND COALESCE(src.chair_name, '') <> ''
+               ) AS cited_by_chairs,
+               (SELECT array_agg(DISTINCT src.case_number ORDER BY src.case_number)
+                  FROM precedent_internal_citations picd
+                  JOIN case_law src ON src.id = picd.source_case_law_id
+                       AND src.source_kind = 'internal_committee'
+                  WHERE split_part(mp.citation_norm, '|', 2) <> ''
+                    AND regexp_replace(replace(picd.cited_case_number, '/', '-'),
+                                       '[^0-9-]', '', 'g')
+                        = split_part(mp.citation_norm, '|', 2)
+                    AND COALESCE(src.case_number, '') <> ''
+               ) AS cited_by_decisions"""
 
 
 async def list_missing_precedents(