updated avatars and voice mode

frontend/chat.html

@@ -24,12 +24,12 @@
     <!-- Chat -->
     <div class="chat-container">
         <div class="chat-messages" id="chat-messages">
-            <!-- Welcome section injected by JS -->
+            <!-- Welcome section -->
             <div class="welcome-section" id="welcome-section">
                 <div class="welcome-row">
                     <div class="avatar-container" id="avatar-container">
                         <div class="avatar-ring"></div>
-                        <div class="avatar-placeholder">🎓</div>
+                        <img class="avatar-img" id="avatar-img" src="" alt="Tutor avatar">
                         <div class="avatar-pulse"></div>
                     </div>
                     <div class="welcome-text">
@@ -42,10 +42,31 @@
         </div>
 
         <div class="chat-input-bar">
-            <button class="voice-btn" id="voice-btn" title="Voice input">🎤</button>
-            <input type="text" id="chat-input" placeholder="Type your message or click 🎤 to speak..."
-                autocomplete="off">
+            <!-- Voice toggle -->
+            <label class="voice-toggle" title="Toggle voice mode">
+                <input type="checkbox" id="voice-toggle-input">
+                <span class="voice-toggle-slider"></span>
+                <svg class="voice-toggle-icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                    <path d="M12 1a3 3 0 0 0-3 3v8a3 3 0 0 0 6 0V4a3 3 0 0 0-3-3z" />
+                    <path d="M19 10v2a7 7 0 0 1-14 0v-2" />
+                    <line x1="12" y1="19" x2="12" y2="23" />
+                    <line x1="8" y1="23" x2="16" y2="23" />
+                </svg>
+            </label>
+
+            <input type="text" id="chat-input" placeholder="Type your message..." autocomplete="off">
             <button class="btn btn-primary" id="send-btn">Send</button>
+
+            <!-- Mic button (visible only when voice mode ON) -->
+            <button class="mic-btn hidden" id="mic-btn" title="Hold to speak">
+                <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round"
+                    stroke-linejoin="round">
+                    <path d="M12 1a3 3 0 0 0-3 3v8a3 3 0 0 0 6 0V4a3 3 0 0 0-3-3z" />
+                    <path d="M19 10v2a7 7 0 0 1-14 0v-2" />
+                    <line x1="12" y1="19" x2="12" y2="23" />
+                    <line x1="8" y1="23" x2="16" y2="23" />
+                </svg>
+            </button>
         </div>
     </div>