a11y: missing aria label for dark mode switch

components/app/AppDarkModeToggle.vue

 <template>
-  <t-toggle v-model="mode" value="dark" unchecked-value="light" variant="dark">
+  <t-toggle
+    v-model="mode"
+    value="dark"
+    unchecked-value="light"
+    variant="dark"
+    :aria-checked="mode"
+    aria-label="Toggle dark mode"
+  >
     <fa
       slot="unchecked"
       icon="sun"