feat: Enhance mobile chat experience with responsive design and navigation

- Implement mobile-first design for the chat interface, optimizing touch interactions and navigation.
- Introduce a peer list view that displays only peers until a selection is made, followed by a full-width chat view.
- Add a back button for easy navigation and ensure touch-friendly elements for better usability.
- Optimize message bubbles and avatars for mobile readability and visibility.
- Update documentation to reflect new mobile-responsive features and navigation improvements.

src/components/nostr/ChatComponent.vue

@@ -1,9 +1,85 @@
 <template>
   <div 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>
+    <!-- Mobile: Peer List View -->
+    <div v-if="!selectedPeer || (isMobile && !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">
+          <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" />
+          <span class="hidden sm:inline ml-2">Refresh</span>
+        </Button>
+      </div>
+
+      <!-- Peer List -->
+      <div class="flex-1 overflow-hidden">
+        <div class="p-4 border-b">
+          <h3 class="font-medium">Peers ({{ peers.length }})</h3>
+        </div>
+        <ScrollArea class="h-full">
+          <div class="p-2 space-y-1">
+            <div
+              v-for="peer in peers"
+              :key="peer.user_id"
+              @click="selectPeer(peer)"
+              :class="[
+                'flex items-center space-x-3 p-3 rounded-lg cursor-pointer transition-colors touch-manipulation',
+                selectedPeer?.user_id === peer.user_id
+                  ? 'bg-primary text-primary-foreground'
+                  : 'hover:bg-muted active:bg-muted/80'
+              ]"
+            >
+              <Avatar class="h-10 w-10 sm:h-8 sm:w-8">
+                <AvatarImage v-if="getPeerAvatar(peer)" :src="getPeerAvatar(peer)!" />
+                <AvatarFallback>{{ getPeerInitials(peer) }}</AvatarFallback>
+              </Avatar>
+              <div class="flex-1 min-w-0">
+                <p class="text-sm font-medium truncate">
+                  {{ peer.username || 'Unknown User' }}
+                </p>
+                <p class="text-xs text-muted-foreground truncate">
+                  {{ formatPubkey(peer.pubkey) }}
+                </p>
+              </div>
+            </div>
+          </div>
+        </ScrollArea>
+      </div>
+    </div>
+
+    <!-- Mobile: Chat View -->
+    <div v-else-if="isMobile && showChat" class="flex flex-col h-full">
+      <!-- Chat Header with Back Button -->
+      <div class="flex items-center justify-between p-4 border-b">
+        <div class="flex items-center space-x-3">
+          <Button 
+            variant="ghost" 
+            size="icon" 
+            @click="goBackToPeers"
+            class="mr-2"
+          >
+            <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>
+          </Avatar>
+          <div>
+            <h3 class="font-medium">{{ selectedPeer.username || 'Unknown User' }}</h3>
+            <p class="text-xs text-muted-foreground">
+              {{ formatPubkey(selectedPeer.pubkey) }}
+            </p>
+          </div>
+        </div>
         <Badge v-if="isConnected" variant="default" class="text-xs">
           Connected
         </Badge>
@@ -11,15 +87,54 @@
           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>
+
+      <!-- Messages -->
+      <ScrollArea class="flex-1 p-4">
+        <div class="space-y-4">
+          <div
+            v-for="message in currentMessages"
+            :key="message.id"
+            :class="[
+              'flex',
+              message.sent ? 'justify-end' : 'justify-start'
+            ]"
+          >
+            <div
+              :class="[
+                'max-w-[75%] px-4 py-2 rounded-lg',
+                message.sent
+                  ? 'bg-primary text-primary-foreground'
+                  : 'bg-muted'
+              ]"
+            >
+              <p class="text-sm break-words">{{ message.content }}</p>
+              <p class="text-xs opacity-70 mt-1">
+                {{ formatTime(message.created_at) }}
+              </p>
+            </div>
+          </div>
+        </div>
+        <div ref="messagesEndRef" />
+      </ScrollArea>
+
+      <!-- Message Input -->
+      <div class="p-4 border-t bg-background">
+        <form @submit.prevent="sendMessage" class="flex space-x-2">
+          <Input
+            v-model="messageInput"
+            placeholder="Type a message..."
+            :disabled="!isConnected || !selectedPeer"
+            class="flex-1"
+          />
+          <Button type="submit" :disabled="!isConnected || !selectedPeer || !messageInput.trim()">
+            <Send class="h-4 w-4" />
+          </Button>
+        </form>
+      </div>
     </div>
 
-    <!-- Main Content -->
-    <div class="flex flex-1 overflow-hidden">
+    <!-- Desktop: Split View -->
+    <div v-else class="flex flex-1 overflow-hidden">
       <!-- Peer List -->
       <div class="w-80 border-r bg-muted/30">
         <div class="p-4 border-b">
@@ -136,7 +251,7 @@
 
 <script setup lang="ts">
 import { ref, computed, onMounted, onUnmounted, nextTick, watch } from 'vue'
-import { Send, RefreshCw, MessageSquare } from 'lucide-vue-next'
+import { Send, RefreshCw, MessageSquare, ArrowLeft } from 'lucide-vue-next'
 import { Button } from '@/components/ui/button'
 import { Input } from '@/components/ui/input'
 import { Badge } from '@/components/ui/badge'
@@ -164,6 +279,21 @@ const selectedPeer = ref<Peer | null>(null)
 const messageInput = ref('')
 const messagesEndRef = ref<HTMLDivElement | null>(null)
 const isLoading = ref(false)
+const showChat = ref(false)
+
+// Mobile detection
+const isMobile = ref(false)
+
+// Check if device is mobile
+const checkMobile = () => {
+  isMobile.value = window.innerWidth < 768 // md breakpoint
+}
+
+// Mobile navigation
+const goBackToPeers = () => {
+  showChat.value = false
+  selectedPeer.value = null
+}
 
 // Nostr chat composable
 const {
@@ -218,6 +348,11 @@ const selectPeer = async (peer: Peer) => {
   selectedPeer.value = peer
   messageInput.value = ''
   
+  // On mobile, show chat view
+  if (isMobile.value) {
+    showChat.value = true
+  }
+  
   // Subscribe to messages from this peer
   await subscribeToPeer(peer.pubkey)
   
@@ -274,11 +409,15 @@ const getPeerInitials = (peer: Peer) => {
 
 // Lifecycle
 onMounted(async () => {
+  checkMobile()
+  window.addEventListener('resize', checkMobile)
+  
   await connect()
   await loadPeers()
 })
 
 onUnmounted(() => {
+  window.removeEventListener('resize', checkMobile)
   disconnect()
 })