chore: silence svelte state referenced locally warning (#28263)

web/svelte.config.js

@@ -35,6 +35,12 @@ const config = {
       'chromecast-caf-sender': './node_modules/@types/chromecast-caf-sender/index.d.ts',
     },
   },
+  onwarn: (warning, handler) => {
+    if (warning.code === 'state_referenced_locally') {
+      return;
+    }
+    handler(warning);
+  },
 };
 
 export default config;