fix retrieval of column names -- so now most ops are working (but not all, eg. set name)

src/services/platforms/CapacitorPlatformService.ts

@@ -144,7 +144,7 @@ export class CapacitorPlatformService implements PlatformService {
               operation.params,
             );
             result = {
-              columns: [], // SQLite plugin doesn't provide column names
+              columns: Object.keys(queryResult.values?.[0] || {}),
               values: (queryResult.values || []).map((row) =>
                 Object.values(row),
               ),