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src/views/InstructorView.js

@@ -217,8 +217,10 @@ export async function renderInstructorView() {
                         <div class="w-px h-6 bg-gray-600 mx-2"></div>
 
                         <!-- Eraser -->
-                        <button class="annotation-tool p-2 rounded-full hover:bg-gray-700 transition-colors ring-2 ring-transparent focus:outline-none" data-tool="eraser" onclick="setPenTool('eraser', null, this)" title="橡皮擦">
-                            <span class="text-sm">🧽</span>
+                        <button class="annotation-tool p-2 rounded-full hover:bg-gray-700 transition-colors ring-2 ring-transparent focus:outline-none flex items-center justify-center" data-tool="eraser" onclick="setPenTool('eraser', null, this)" title="橡皮擦">
+                            <svg xmlns="http://www.w3.org/2000/svg" class="w-5 h-5 text-gray-400" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
+                                <path stroke-linecap="round" stroke-linejoin="round" d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16" />
+                            </svg>
                         </button>
 
                         <div class="w-px h-6 bg-gray-600 mx-2"></div>
@@ -1805,7 +1807,7 @@ export function setupInstructorEvents() {
         document.getElementById('broadcast-author').textContent = student.nickname;
         document.getElementById('broadcast-challenge').textContent = title;
         // content is already just text, but let's be safe
-        document.getElementById('broadcast-prompt').textContent = p.prompt || p.code || ''; // robust fallback
+        document.getElementById('broadcast-prompt').textContent = (p.prompt || p.code || '').trim(); // robust fallback
 
         // Store IDs for actions
         modal.dataset.userId = userId;