Feat: enable deals search by gush+plot

The deals tab was previously disabled when searching by block+plot
because find_recent_deals_for_address needs an address string. Govmap's
autocomplete in fact accepts the literal "גוש N חלקה M" and returns
the parcel coordinates, so we just compose that string client-side
and let the rest of the pipeline (coords → polygon → deals) run as-is.

Verified live: search "Block=6212 Plot=894" now returns the same two
deals on יהודה המכבי that an address search would.

Appraiser-name search still disables the deals tab — there's no
location to anchor a deals query on.

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

web/src/App.tsx

@@ -23,17 +23,34 @@ function useAddressInfo(address: string | undefined) {
   });
 }
 
+// Translate the SearchQuery into the single `address` string that the
+// Govmap deals API needs. For block+plot, we lean on the fact that
+// Govmap's autocomplete recognises the literal string "גוש N חלקה M"
+// and returns parcel coordinates — so the rest of the pipeline (coords
+// → polygon → deals) keeps working unchanged.
+function dealsSearchAddress(query: SearchQuery | null): string | null {
+  if (!query) return null;
+  if (query.mode === "address" && query.address) return query.address;
+  if (query.mode === "block_plot" && query.block) {
+    return query.plot
+      ? `גוש ${query.block} חלקה ${query.plot}`
+      : `גוש ${query.block}`;
+  }
+  return null;
+}
+
 function useDeals(query: SearchQuery | null) {
+  const address = dealsSearchAddress(query);
   return useQuery({
-    queryKey: ["deals", query],
+    queryKey: ["deals", address],
     queryFn: () =>
       api.searchDeals({
-        address: query!.address!,
+        address: address!,
         years_back: 3,
         radius_meters: 100,
         max_deals: 50,
       }),
-    enabled: !!query && query.mode === "address" && !!query.address,
+    enabled: !!address,
   });
 }
 
@@ -191,7 +208,7 @@ export default function App() {
                 )}
                 {!deals.isFetching && !deals.error && !deals.data && (
                   <div className="text-center py-12 text-muted-foreground">
-                    חיפוש עסקאות זמין רק לפי כתובת.
+                    חיפוש עסקאות זמין לפי כתובת או גוש+חלקה. חיפוש לפי שם שמאי מציג רק החלטות שמאי.
                   </div>
                 )}
               </TabsContent>