fix: remove redundant question thumbnail from quiz details panel

The question is already visible in the main quiz area, no need to
show it again in the details panel.

Co-Authored-By: Claude (claude-opus-4-5-thinking) <noreply@anthropic.com>

templates/quiz_v2.html

@@ -95,17 +95,6 @@
         font-size: 0.9rem;
         color: #e9ecef;
     }
-    .details-spoiler .details-grid {
-        display: grid;
-        grid-template-columns: 1fr 1fr;
-        gap: 15px;
-    }
-    .details-spoiler .question-thumb {
-        max-height: 200px;
-        object-fit: contain;
-        border-radius: 6px;
-        border: 1px solid #495057;
-    }
     .details-spoiler .note-thumb {
         max-height: 200px;
         object-fit: contain;
@@ -123,11 +112,6 @@
         color: #0dcaf0;
         margin-bottom: 8px;
     }
-    @media (max-width: 768px) {
-        .details-spoiler .details-grid {
-            grid-template-columns: 1fr;
-        }
-    }
 
     /* --- BUTTON STYLES --- */
     .btn-pill { border-radius: 50px; }
@@ -195,15 +179,9 @@
 
     <!-- 3. Details (Hidden by default) -->
     <div class="details-spoiler" id="details-spoiler">
-        <div class="details-grid">
-            <div>
-                <h6 class="text-white mb-2"><i class="bi bi-image me-1"></i>Question</h6>
-                <img id="details-question-img" src="" class="question-thumb" alt="Question">
-            </div>
-            <div id="details-info">
-                <h6 class="text-white mb-2"><i class="bi bi-info-circle me-1"></i>Details</h6>
-                <div id="details-content"></div>
-            </div>
+        <div id="details-info">
+            <h6 class="text-white mb-2"><i class="bi bi-info-circle me-1"></i>Details</h6>
+            <div id="details-content"></div>
         </div>
         <div id="note-section" class="note-section" style="display: none;">
             <h6><i class="bi bi-journal-text me-1"></i>Revision Notes</h6>
@@ -369,9 +347,6 @@ document.addEventListener('DOMContentLoaded', () => {
         if(d.options && d.options.length) { h += '<ol type="A" style="padding-left:15px; margin:5px 0;">'; d.options.forEach(o=>h+=`<li>${o}</li>`); h+='</ol>'; }
         document.getElementById('details-content').innerHTML = h;
 
-        // Set question thumbnail in details panel
-        document.getElementById('details-question-img').src = path;
-
         // Set revision note if available
         const noteSection = document.getElementById('note-section');
         const noteImg = document.getElementById('details-note-img');