Remove committee_type from case wizard and header

The committee_type field in FastAPI's CaseCreateRequest is a leftover
with no meaningful UI. Appeals against a ועדה מקומית / ועדה מחוזית are
legally distinguishable by case-number range, not by a picked committee
label; appeals against a ועדת ערר decision go to בית משפט לעניינים
מנהליים and never enter this system at all. The backend retains its
"ועדה מקומית" default, which is what we'd send anyway.

Drop the Select from the wizard's basics step and the "ועדה" row from
the case detail header. The Case TS type keeps the optional field so
existing API responses still parse cleanly.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

web-ui/src/lib/schemas/case.ts

@@ -24,12 +24,6 @@ const dateString = z
     message: "תאריך חייב להיות בפורמט YYYY-MM-DD",
   });
 
-export const committeeTypes = [
-  "ועדה מקומית",
-  "ועדה מחוזית",
-  "ועדת ערר",
-] as const;
-
 export const expectedOutcomes = [
   { value: "",                   label: "— לא נקבע —" },
   { value: "rejection",          label: "דחייה" },
@@ -54,7 +48,6 @@ export const caseCreateSchema = z.object({
   subject: z.string().trim().max(500),
   property_address: z.string().trim().max(200),
   permit_number: z.string().trim().max(100),
-  committee_type: z.enum(committeeTypes),
   hearing_date: dateString,
   notes: z.string().trim().max(2000),
   expected_outcome: z.enum(