use runes mode, allow switching locale without js

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

app/src/components/card.svelte

@@ -1,14 +1,13 @@
 <script>
-  export let title = "";
-  export let id = "";
+  let { title = "", id = "", children } = $props();
 </script>
 
 <main {id}>
   {#if title === ""}
-    <div><slot></slot></div>
+    <div>{@render children()}</div>
   {:else}
     <h1>{title}</h1>
-    <div class="padded"><slot></slot></div>
+    <div class="padded">{@render children()}</div>
   {/if}
 </main>