ui(precedents): upload sheet routes ערר/בל"מ to internal-decisions endpoint

Citations starting with ערר/בל"מ/ARAR are committee decisions and must
carry chair_name + district. The /precedents upload form previously
errored out for these (precedent_library service rejects them) with no
in-UI path forward — internal_decision_upload was only reachable via
the /missing-precedents flow.

The form now auto-detects committee citations, reveals chair_name +
district fields, hides the irrelevant source_type/precedent_level
(derived server-side), and posts to /api/internal-decisions/upload.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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

@@ -355,6 +355,85 @@ export function useUploadPrecedent() {
   });
 }
 
+// Valid Hebrew districts for appeals-committee decisions. Mirrors
+// VALID_DISTRICTS in mcp-server/src/legal_mcp/tools/internal_decisions.py —
+// keep in sync with the service-side guard.
+export const COMMITTEE_DISTRICTS = [
+  "ירושלים",
+  "תל אביב",
+  "מרכז",
+  "חיפה",
+  "צפון",
+  "דרום",
+  "ארצי",
+] as const;
+
+export type CommitteeDistrict = (typeof COMMITTEE_DISTRICTS)[number];
+
+// A citation that targets internal_decision_upload, not the external library.
+// Matches the prefix list in precedent_library service (ערר/בל"מ/ARAR).
+const COMMITTEE_PREFIXES = ["ערר ", "ערר(", "בל\"מ ", "בל\"מ(", "ARAR "];
+
+export function isCommitteeCitation(citation: string): boolean {
+  const c = citation.trimStart();
+  return COMMITTEE_PREFIXES.some((p) => c.startsWith(p));
+}
+
+export type InternalDecisionUploadInput = {
+  file: File;
+  case_number: string;
+  chair_name: string;
+  district: CommitteeDistrict | string;
+  case_name?: string;
+  court?: string;
+  decision_date?: string;
+  practice_area?: PracticeArea;
+  appeal_subtype?: string;
+  subject_tags?: string[];
+  is_binding?: boolean;
+  summary?: string;
+};
+
+export function useUploadInternalDecision() {
+  const qc = useQueryClient();
+  return useMutation({
+    mutationFn: async (input: InternalDecisionUploadInput) => {
+      const fd = new FormData();
+      fd.append("file", input.file);
+      fd.append("case_number", input.case_number);
+      fd.append("chair_name", input.chair_name);
+      fd.append("district", input.district);
+      if (input.case_name) fd.append("case_name", input.case_name);
+      if (input.court) fd.append("court", input.court);
+      if (input.decision_date) fd.append("decision_date", input.decision_date);
+      if (input.practice_area) fd.append("practice_area", input.practice_area);
+      if (input.appeal_subtype)
+        fd.append("appeal_subtype", input.appeal_subtype);
+      if (input.subject_tags && input.subject_tags.length)
+        fd.append("subject_tags", JSON.stringify(input.subject_tags));
+      fd.append("is_binding", String(input.is_binding ?? false));
+      if (input.summary) fd.append("summary", input.summary);
+
+      const res = await fetch("/api/internal-decisions/upload", {
+        method: "POST",
+        body: fd,
+      });
+      const parsed = await res.json().catch(() => null);
+      if (!res.ok) {
+        throw new ApiError(
+          `Upload failed with ${res.status}`,
+          res.status,
+          parsed,
+        );
+      }
+      return parsed as { task_id: string };
+    },
+    onSuccess: () => {
+      qc.invalidateQueries({ queryKey: libraryKeys.all });
+    },
+  });
+}
+
 export function useDeletePrecedent() {
   const qc = useQueryClient();
   return useMutation({