🛠️ Add route transitions.

src/components/transition.svelte

@@ -0,0 +1,10 @@
+<script lang="ts">
+  import { fade } from 'svelte/transition';
+  export let pathname: string = '';
+</script>
+
+{#key pathname}
+  <div in:fade={{ duration: 300 }}>
+    <slot />
+  </div>
+{/key}