feat(proceeding-type): explicit ערר/בל"מ field for cases + corpus

Same case_number can exist as both a regular appeal (ערר) and an
extension-of-time request (בל"מ), and we were inferring the difference
from appeal_subtype prefixes — fragile, and case-number lookups
weren't disambiguated. Now stored as a first-class field on both
case_law (corpus) and cases (live cases), with partial unique indexes
on (case_number, proceeding_type).

- SCHEMA_V15: column + CHECK constraints + backfill from
  appeal_subtype LIKE 'extension_request_%' + partial unique indexes
  replace the old global UNIQUE(case_number).
- derive_proceeding_type() centralizes the inference rule
  (extension_request_* → בל"מ; subject regex fallback; default ערר).
- Metadata extractor prompt asks Claude to populate the new field
  explicitly; apply_to_record writes it for internal_committee rows.
- internal_decision_upload, case_create, case_update accept an
  optional proceeding_type; FastAPI request models expose it.
- Wizard + edit dialog get a sided Select; case header renders the
  resolved label (ערר / בל"מ).
- Uploaded the 2 staged בל"מ decisions on betterment levy:
  8126/24 (סופר נוח, 13 chunks), 8047/23 (הרנון, 48 chunks).

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

web-ui/src/components/cases/case-edit-dialog.tsx

@@ -17,7 +17,10 @@ import {
 } from "@/components/ui/select";
 import { PartiesField } from "@/components/wizard/parties-field";
 import { useUpdateCase } from "@/lib/api/cases";
-import { caseUpdateSchema, expectedOutcomes, type CaseUpdateInput } from "@/lib/schemas/case";
+import {
+  caseUpdateSchema, expectedOutcomes, proceedingTypes,
+  type CaseUpdateInput,
+} from "@/lib/schemas/case";
 import type { CaseDetail } from "@/lib/api/cases";
 
 /*
@@ -47,6 +50,7 @@ export function CaseEditDialog({ data }: { data: CaseDetail }) {
       respondents: data.respondents ?? [],
       property_address: data.property_address ?? "",
       permit_number: data.permit_number ?? "",
+      proceeding_type: data.proceeding_type ?? "ערר",
     },
   });
 
@@ -63,6 +67,7 @@ export function CaseEditDialog({ data }: { data: CaseDetail }) {
       respondents: data.respondents ?? [],
       property_address: data.property_address ?? "",
       permit_number: data.permit_number ?? "",
+      proceeding_type: data.proceeding_type ?? "ערר",
     });
   }, [open, data, form]);
 
@@ -104,6 +109,37 @@ export function CaseEditDialog({ data }: { data: CaseDetail }) {
             <FieldError message={form.formState.errors.subject?.message} />
           </div>
 
+          <div>
+            <Label className="text-navy">סוג תיק</Label>
+            <Controller
+              control={form.control}
+              name="proceeding_type"
+              render={({ field }) => (
+                <Select
+                  value={field.value ?? "ערר"}
+                  onValueChange={(v) =>
+                    field.onChange(v as CaseUpdateInput["proceeding_type"])
+                  }
+                  dir="rtl"
+                >
+                  <SelectTrigger className="mt-1">
+                    <SelectValue />
+                  </SelectTrigger>
+                  <SelectContent>
+                    {proceedingTypes.map((p) => (
+                      <SelectItem key={p.value} value={p.value}>
+                        {p.label}
+                      </SelectItem>
+                    ))}
+                  </SelectContent>
+                </Select>
+              )}
+            />
+            <p className="text-[0.7rem] text-ink-muted mt-1">
+              ערר = הליך עיקרי; בל&quot;מ = בקשה להארכת מועד להגשת ערר
+            </p>
+          </div>
+
           <div className="h-px bg-rule" />
 
           <Controller