refactor(test-app): use $props destructuring in pages

Refactor Page2.svelte and InvalidateTags.svelte to use $props destructuring instead of export let for props. This improves consistency and leverages the recommended Svelte 5 pattern.

Author: brodienguyen

packages/svelte5/test-app/Pages/DeferredProps/Page2.svelte

@@ -1,8 +1,7 @@
 <script lang="ts">
   import { Deferred } from '@inertiajs/svelte5'
 
-  export let baz: string | undefined
-  export let qux: string | undefined
+  const { baz, qux }: { baz?: string; qux?: string } = $props()
 </script>
 
 <Deferred data="baz">

packages/svelte5/test-app/Pages/FormComponent/InvalidateTags.svelte

@@ -1,8 +1,7 @@
 <script lang="ts">
   import { Link, Form } from '@inertiajs/svelte5'
 
-  export let lastLoaded
-  export let propType
+  const { lastLoaded, propType } = $props()
 </script>
 
 <div>