feat(cdp): Phase 2 - real-time UI mirroring via screencast + remote input

public/index.html

@@ -75,6 +75,10 @@
               <span class="chat-session-status" id="chatSessionStatus"></span>
             </div>
             <div class="chat-actions">
+              <div class="view-tabs" id="viewTabs">
+                <button class="view-tab active" data-view="chat" id="tabChat">💬 채팅</button>
+                <button class="view-tab" data-view="mirror" id="tabMirror">🖥️ 미러</button>
+              </div>
               <button class="btn-sm" id="screenshotBtn" title="스크린샷">📷</button>
               <button class="btn-sm" id="reconnectBtn" title="재연결">🔄</button>
             </div>
@@ -96,6 +100,12 @@
               </svg>
             </button>
           </div>
+
+          <!-- Mirror view (Phase 2) -->
+          <div class="mirror-container" id="mirrorContainer" style="display:none;">
+            <canvas id="mirrorCanvas"></canvas>
+            <div class="mirror-hint" id="mirrorHint">미러링 연결 중...</div>
+          </div>
         </div>
 
         <!-- Screenshot overlay -->
@@ -145,6 +155,7 @@
 
   <script src="js/session-panel.js"></script>
   <script src="js/chat-panel.js"></script>
+  <script src="js/mirror-panel.js"></script>
   <script src="js/app.js"></script>
 </body>
 </html>