use runes mode, allow switching locale without js

Signed-off-by: ngn <ngn@ngn.tf>

app/svelte.config.js

@@ -6,6 +6,9 @@ const config = {
     adapter: adapter(),
     alias: { $components: "src/components" },
   },
+  compilerOptions: {
+    runes: true,
+  },
 };
 
 export default config;