feat: Add peer notification subscriptions in Nostr chat

- Implement a new method to subscribe to peers for notifications without loading full message history.
- Enhance the ChatComponent to automatically subscribe to peers when the connection is established.
- Update the useNostrChat composable to include the new subscription method and handle notification events.
- Improve logging for subscription status and errors to aid in debugging.

src/composables/useNostrChat.ts

@@ -329,10 +329,70 @@ export function useNostrChat() {
         onevent(event) {
           console.log('Received live event:', event.id, 'author:', event.pubkey)
           handleIncomingMessage(event, peerPubkey)
+        },
+        oneose() {
+          console.log('Subscription closed for peer:', peerPubkey)
         }
       }
     )
+    
+    return sub
+  }
 
+  // Subscribe to a peer for notifications only (without loading full message history)
+  const subscribeToPeerForNotifications = async (peerPubkey: string) => {
+    if (!currentUser.value) {
+      console.warn('No user logged in - cannot subscribe to peer notifications')
+      return null
+    }
+    
+    // Check if we have a pool and are connected
+    if (!pool.value) {
+      console.warn('No pool available - initializing...')
+      initializePool()
+    }
+    
+    if (!isConnected.value) {
+      console.warn('Not connected to relays - attempting to connect...')
+      await connect()
+    }
+    
+    if (!pool.value) {
+      throw new Error('Failed to initialize Nostr pool')
+    }
+
+    const myPubkey = currentUser.value.pubkey
+    
+    // Subscribe to new messages only (no historical messages)
+    const relayConfigs = getRelays()
+    console.log('Subscribing to notifications for peer:', peerPubkey, 'with my pubkey:', myPubkey)
+    
+    const sub = pool.value.subscribeMany(
+      relayConfigs.map(r => r.url),
+      [
+        {
+          kinds: [4],
+          authors: [peerPubkey],
+          '#p': [myPubkey]
+        },
+        {
+          kinds: [4],
+          authors: [myPubkey],
+          '#p': [peerPubkey]
+        }
+      ],
+      {
+        onevent(event) {
+          console.log('Received notification event:', event.id, 'author:', event.pubkey, 'for peer:', peerPubkey)
+          handleIncomingMessage(event, peerPubkey)
+        },
+        oneose() {
+          console.log('Notification subscription closed for peer:', peerPubkey)
+        }
+      }
+    )
+    
+    console.log('Successfully created notification subscription for peer:', peerPubkey)
     return sub
   }
 
@@ -631,6 +691,7 @@ export function useNostrChat() {
     connect,
     disconnect,
     subscribeToPeer,
+    subscribeToPeerForNotifications,
     sendMessage,
     getMessages,
     clearMessages,