Unify auth: bridge auth store and Nostr account on every login path

The app had two disconnected auth systems:
- Auth store (useAuth): controls isAuthenticated, subscription, My List
- Account manager (useAccounts): controls isNostrLoggedIn, comments

Previously each login path only populated one system:
- Persona login → Nostr only (no subscription/My List)
- AuthModal Nostr → Auth store only (no commenting)
- Extension login → Nostr only (no subscription/My List)

Now every login path bridges both systems:
- Persona/extension login also calls auth store loginWithNostr
- AuthModal Nostr login also registers extension in accountManager
- Logout already cleared both (no change needed)

Co-authored-by: Cursor <cursoragent@cursor.com>

src/components/AuthModal.vue

@@ -122,6 +122,7 @@
 <script setup lang="ts">
 import { ref, computed } from 'vue'
 import { useAuth } from '../composables/useAuth'
+import { useAccounts } from '../composables/useAccounts'
 
 interface Props {
   isOpen: boolean
@@ -140,6 +141,7 @@ const props = withDefaults(defineProps<Props>(), {
 const emit = defineEmits<Emits>()
 
 const { login, loginWithNostr, register, isLoading: authLoading } = useAuth()
+const { loginWithExtension } = useAccounts()
 
 const mode = ref<'login' | 'register' | 'forgot'>(props.defaultMode)
 const formData = ref({
@@ -206,9 +208,16 @@ async function handleNostrLogin() {
     // Sign event with extension
     const signedEvent = await window.nostr.signEvent(authEvent)
 
-    // Create session with backend
+    // Create session with backend (auth store — subscription/My List)
     await loginWithNostr(pubkey, signedEvent.sig, signedEvent)
 
+    // Also register extension account in accountManager (commenting/reactions)
+    try {
+      await loginWithExtension()
+    } catch {
+      // Non-critical — extension account already obtained pubkey above
+    }
+
     emit('success')
     closeModal()
   } catch (error: any) {