upgrade supabase auth to recommended

pages/confirm.vue

@@ -0,0 +1,15 @@
+<script setup lang="ts">
+  const user = useSupabaseUser();
+  watch(
+    user,
+    () => {
+      if (user.value) {
+        return navigateTo('/dashboard');
+      }
+    },
+    { immediate: true }
+  );
+</script>
+<template>
+  <div>Logging you in...</div>
+</template>