fix(table): return 400 instead of 500 on empty batch insert (#4329)

The POST /api/table/[tableId]/rows handler called handleBatchInsert
without await, so ZodError rejections (e.g. empty rows array) bypassed
the route's try/catch and were caught by withRouteHandler as an
unhandled error, returning a generic 500 "Internal server error". Add
await so validation errors surface as 400s with the actual message.

apps/sim/app/api/table/[tableId]/rows/route.ts

@@ -232,7 +232,7 @@ export const POST = withRouteHandler(
         'rows' in body &&
         Array.isArray((body as Record<string, unknown>).rows)
       ) {
-        return handleBatchInsert(
+        return await handleBatchInsert(
           requestId,
           tableId,
           body as z.infer<typeof BatchInsertRowsSchema>,