fix: Refine mobile chat layout and peer selection logic

- Adjust mobile chat component to ensure proper display of peer list and chat view based on selection.
- Enhance avatar and username rendering for selected peers, ensuring fallback options are in place.
- Improve responsiveness and usability of the chat interface, particularly for mobile users.
- Update message display logic to maintain consistency across different screen sizes.

refactor: Update desktop chat layout for improved structure

- Change the layout of the desktop chat component to use a full-height column flexbox, enhancing the overall structure and responsiveness.
- Ensure better alignment and spacing within the chat interface for a more organized appearance.

src/components/nostr/ChatComponent.vue

@@ -1,7 +1,7 @@
 <template>
   <div class="flex flex-col h-full">
     <!-- Mobile: Peer List View -->
-    <div v-if="!selectedPeer || (isMobile && !showChat)" class="flex flex-col h-full">
+    <div v-if="isMobile && (!selectedPeer || !showChat)" class="flex flex-col h-full">
       <!-- Header -->
       <div class="flex items-center justify-between p-4 border-b">
         <div class="flex items-center space-x-3">
@@ -70,13 +70,13 @@
               <ArrowLeft class="h-5 w-5" />
             </Button>
             <Avatar class="h-8 w-8">
-            <AvatarImage v-if="getPeerAvatar(selectedPeer)" :src="getPeerAvatar(selectedPeer)!" />
-            <AvatarFallback>{{ getPeerInitials(selectedPeer) }}</AvatarFallback>
+              <AvatarImage v-if="selectedPeer && getPeerAvatar(selectedPeer)" :src="getPeerAvatar(selectedPeer)!" />
+              <AvatarFallback>{{ selectedPeer ? getPeerInitials(selectedPeer) : 'U' }}</AvatarFallback>
             </Avatar>
             <div>
-            <h3 class="font-medium">{{ selectedPeer.username || 'Unknown User' }}</h3>
+              <h3 class="font-medium">{{ selectedPeer?.username || 'Unknown User' }}</h3>
               <p class="text-xs text-muted-foreground">
-              {{ formatPubkey(selectedPeer.pubkey) }}
+                {{ selectedPeer ? formatPubkey(selectedPeer.pubkey) : '' }}
               </p>
             </div>
           </div>
@@ -134,7 +134,27 @@
     </div>
 
     <!-- Desktop: Split View -->
-    <div v-else class="flex flex-1 overflow-hidden">
+    <div v-else-if="!isMobile" class="flex flex-col h-full">
+      <!-- Header -->
+      <div class="flex items-center justify-between p-4 border-b">
+        <div class="flex items-center space-x-3">
+          <h2 class="text-lg font-semibold">Chat</h2>
+          <Badge v-if="isConnected" variant="default" class="text-xs">
+            Connected
+          </Badge>
+          <Badge v-else variant="secondary" class="text-xs">
+            Disconnected
+          </Badge>
+        </div>
+        <Button @click="refreshPeers" :disabled="isLoading" size="sm">
+          <RefreshCw v-if="isLoading" class="h-4 w-4 animate-spin" />
+          <RefreshCw v-else class="h-4 w-4" />
+          Refresh Peers
+        </Button>
+      </div>
+
+      <!-- Main Content -->
+      <div class="flex flex-1 overflow-hidden">
         <!-- Peer List -->
         <div class="w-80 border-r bg-muted/30">
           <div class="p-4 border-b">
@@ -247,6 +267,7 @@
         </div>
       </div>
     </div>
+  </div>
 </template>
 
 <script setup lang="ts">