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/AppHeader.vue

@@ -213,6 +213,7 @@ import { ref, computed, onMounted, onUnmounted } from 'vue'
 import { useRouter, useRoute } from 'vue-router'
 import { useAuth } from '../composables/useAuth'
 import { useAccounts } from '../composables/useAccounts'
+import { accountManager } from '../lib/accounts'
 import { useContentDiscovery } from '../composables/useContentDiscovery'
 
 type Persona = { name: string; nsec: string; pubkey: string }
@@ -237,7 +238,7 @@ const emit = defineEmits<Emits>()
 
 const router = useRouter()
 const route = useRoute()
-const { user, isAuthenticated, logout: appLogout } = useAuth()
+const { user, isAuthenticated, loginWithNostr: appLoginWithNostr, logout: appLogout } = useAuth()
 const {
   isLoggedIn: nostrLoggedIn,
   activePubkey: nostrActivePubkey,
@@ -347,11 +348,28 @@ function navigateTo(path: string) {
 
 async function handlePersonaLogin(persona: Persona) {
   personaMenuOpen.value = false
+  // Set up Nostr account (for commenting/reactions)
   await loginWithPersona(persona)
+  // Also populate auth store (for subscription/My List access)
+  try {
+    await appLoginWithNostr(persona.pubkey, 'persona', {})
+  } catch {
+    // Auth store mock login — non-critical if it fails
+  }
 }
 
 async function handleExtensionLogin() {
+  // Set up Nostr account (for commenting/reactions)
   await loginWithExtension()
+  // Also populate auth store (for subscription/My List access)
+  try {
+    const pubkey = accountManager.active?.pubkey
+    if (pubkey) {
+      await appLoginWithNostr(pubkey, 'extension', {})
+    }
+  } catch {
+    // Auth store mock login — non-critical if it fails
+  }
 }
 
 async function handleLogout() {