extract Login out of Support.vue as its own dialog; add copy button and reminder to save key

src/pages/Support.vue

@@ -1,17 +1,22 @@
 <script setup lang="ts">
 import { useNostrStore } from '@/stores/nostr'
 import SupportChat from '@/components/SupportChat.vue'
-import Login from '@/components/Login.vue'
+import { useRouter } from 'vue-router'
 
+const router = useRouter()
 const nostrStore = useNostrStore()
+
+// Redirect to home if not logged in
+if (!nostrStore.isLoggedIn) {
+  router.push('/')
+}
 </script>
 
 <template>
   <div class="container max-w-4xl mx-auto h-[calc(100vh-4rem)] py-4 px-4 sm:px-6 lg:px-8">
     <div class="h-full">
       <div class="h-full animate-in fade-in-50 slide-in-from-bottom-3">
-        <Login v-if="!nostrStore.isLoggedIn" />
-        <SupportChat v-else />
+        <SupportChat v-if="nostrStore.isLoggedIn" />
       </div>
     </div>
   </div>