feat(precedents): surface auto-detected incoming citations in the "ציטוטים מקושרים" panel

The precedent-detail "ציטוטים מקושרים" panel rendered only MANUAL appeal-chain
links (case_law_relations), so it stayed empty even when decisions cite the
ruling — the automatic citation graph (precedent_internal_citations) was never
surfaced. e.g. עע"מ 317/10 (שפר) has 12 incoming citations in the DB, none shown.

Fills the existing panel from the citation graph (data/logic only, no new
visual design — gate-exempt per web-ui/AGENTS.md):
- citation_extractor.list_citations_to_case_law: return source precedent_level/
  court/date too (additive; reuses the one canonical incoming query — G2).
- precedent_library.get_precedent: add incoming_citations[], shaped like the
  RelatedCase row. No parallel resolution path.
- web-ui: render incoming citations in the same row style, read-only (no unlink),
  de-duped against manual links; manual "קשר" linking preserved alongside.

Invariants: G2 (single citation-resolution path, reused), G1 (graph self-heals
via existing relink_orphan_citations on upload). No schema change.

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

web-ui/src/lib/api/precedent-library.ts

@@ -143,10 +143,24 @@ export type RelatedCase = {
   relation_type: string;
 };
 
+/** A decision that cites THIS ruling — auto-detected from the citation graph
+ *  (precedent_internal_citations incoming edges). Read-only (no unlink). */
+export type IncomingCitation = {
+  id: string;
+  case_number: string;
+  case_name: string;
+  court: string;
+  precedent_level: string;
+  chair_name: string;
+  date: string | null;
+  confidence: number | null;
+};
+
 export type PrecedentDetail = Precedent & {
   full_text: string;
   halachot: Halacha[];
   related_cases: RelatedCase[];
+  incoming_citations: IncomingCitation[];
 };
 
 export type SearchHit =