chore(web): migration svelte 5 syntax (#13883)

web/src/lib/components/i18n/__test__/format-tag-b.svelte

@@ -3,12 +3,18 @@
   import FormatMessage from '../format-message.svelte';
   import type { ComponentProps } from 'svelte';
 
-  export let key: Translations;
-  export let values: ComponentProps<FormatMessage>['values'];
+  interface Props {
+    key: Translations;
+    values: ComponentProps<typeof FormatMessage>['values'];
+  }
+
+  let { key, values }: Props = $props();
 </script>
 
-<FormatMessage {key} {values} let:tag let:message>
-  {#if tag === 'b'}
-    <strong>{message}</strong>
-  {/if}
+<FormatMessage {key} {values}>
+  {#snippet children({ tag, message })}
+    {#if tag === 'b'}
+      <strong>{message}</strong>
+    {/if}
+  {/snippet}
 </FormatMessage>