feat(app): add error page

app/src/routes/+error.svelte

@@ -0,0 +1,20 @@
+<script lang="ts">
+  import { page } from '$app/state';
+</script>
+
+<main class="w-screen h-screen flex flex-col items-center justify-center">
+  <div class="outline-1 outline-outline bg-layer-2">
+    <h1 class="p-8 text-3xl">@nodarium/error</h1>
+    <hr>
+    <pre class="p-8">{JSON.stringify(page.error, null, 2)}</pre>
+    <hr>
+    <div class="flex p-4">
+      <button
+        class="bg-layer-2 outline-1 outline-outline p-3 px-6 rounded-sm cursor-pointer"
+        on:click={() => window.location.reload()}
+      >
+        reload
+      </button>
+    </div>
+  </div>
+</main>