release v1.2.6: AskUserQuestion preview panel, 401 atomic write fix, mobile scrollbar

public/app.js

@@ -528,29 +528,98 @@
       card.appendChild(body);
 
       if (Array.isArray(q.options) && q.options.length > 0) {
+        const hasDesc = q.options.some(o => o.description);
+
+        // 左右分栏容器
+        const layout = document.createElement('div');
+        layout.className = 'ask-options-layout' + (hasDesc ? ' has-preview' : '');
+
         const opts = document.createElement('div');
         opts.className = 'ask-question-options';
+
+        // 右侧预览区（仅在有 description 时创建）
+        const preview = hasDesc ? document.createElement('div') : null;
+        if (preview) {
+          preview.className = 'ask-option-preview';
+          // 默认显示第一项
+          preview.textContent = q.options[0].description || '';
+        }
+
+        // 当前选中项（移动端 tap-to-preview 状态）
+        let selectedOpt = null;
+        let selectedBtn = null;
+
         q.options.forEach((opt, i) => {
           const item = document.createElement('button');
           item.type = 'button';
           item.className = 'ask-option-item';
-          item.addEventListener('click', () => appendAskOptionToInput(q, opt));
 
           const title = document.createElement('div');
           title.className = 'ask-option-label';
           title.textContent = `${i + 1}. ${opt.label || ''}`;
           item.appendChild(title);
 
-          if (opt.description) {
-            const desc = document.createElement('div');
-            desc.className = 'ask-option-desc';
-            desc.textContent = opt.description;
-            item.appendChild(desc);
+          // 桌面：hover 切换预览
+          if (preview) {
+            item.addEventListener('mouseenter', () => {
+              preview.textContent = opt.description || '';
+            });
           }
 
+          item.addEventListener('click', (e) => {
+            const isTouch = item.dataset.touchActivated === '1';
+            item.dataset.touchActivated = '';
+
+            if (isTouch) {
+              // 移动端：第一次 tap = 选中预览，不发送
+              if (selectedBtn !== item) {
+                if (selectedBtn) selectedBtn.classList.remove('ask-option-selected');
+                selectedBtn = item;
+                selectedOpt = opt;
+                item.classList.add('ask-option-selected');
+                if (preview) preview.textContent = opt.description || '';
+                return;
+              }
+              // 第二次 tap 同一项 = 发送
+            }
+
+            // 桌面直接发送
+            appendAskOptionToInput(q, opt);
+          });
+
+          item.addEventListener('touchstart', () => {
+            item.dataset.touchActivated = '1';
+          }, { passive: true });
+
           opts.appendChild(item);
         });
-        card.appendChild(opts);
+
+        layout.appendChild(opts);
+        if (preview) {
+          layout.appendChild(preview);
+          // 预览区最小高度 = 左侧选项列表总高度（渲染后同步）
+          requestAnimationFrame(() => {
+            preview.style.minHeight = opts.offsetHeight + 'px';
+          });
+        }
+
+        // 移动端确认按钮
+        if (hasDesc) {
+          const confirmBtn = document.createElement('button');
+          confirmBtn.type = 'button';
+          confirmBtn.className = 'ask-confirm-btn';
+          confirmBtn.textContent = '确认选择';
+          confirmBtn.addEventListener('click', () => {
+            if (selectedOpt) {
+              appendAskOptionToInput(q, selectedOpt);
+            } else if (q.options.length > 0) {
+              appendAskOptionToInput(q, q.options[0]);
+            }
+          });
+          layout.appendChild(confirmBtn);
+        }
+
+        card.appendChild(layout);
       }
 
       wrapper.appendChild(card);
@@ -681,7 +750,15 @@
     thumbEl.style.top = thumbTop + 'px';
   }
 
-  messagesDiv.addEventListener('scroll', () => updateScrollbar(), { passive: true });
+  messagesDiv.addEventListener('scroll', () => {
+    updateScrollbar();
+    // 移动端：滚动时短暂显示滑块，停止后淡出
+    scrollbarEl.classList.add('scrolling');
+    clearTimeout(scrollbarEl._hideTimer);
+    scrollbarEl._hideTimer = setTimeout(() => {
+      if (!isDragging) scrollbarEl.classList.remove('scrolling');
+    }, 1200);
+  }, { passive: true });
   new ResizeObserver(updateScrollbar).observe(messagesDiv);
 
   // Drag logic

public/style.css

@@ -49,11 +49,9 @@ body {
   -webkit-tap-highlight-color: transparent;
 }
 
-/* Scrollbar */
-::-webkit-scrollbar { width: 5px; }
-::-webkit-scrollbar-track { background: var(--scrollbar-track); }
-::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 3px; }
-::-webkit-scrollbar-thumb:hover { background: #b0a090; }
+/* 全局隐藏原生滚动条，聊天区由 custom-scrollbar 接管 */
+::-webkit-scrollbar { display: none; }
+* { scrollbar-width: none; }
 
 /* === Login === */
 .login-overlay {
@@ -369,6 +367,16 @@ body {
 .custom-scrollbar.active {
   opacity: 1;
 }
+/* 移动端触摸后 hover 会粘滞 — 完全禁用 hover 触发，只靠 .active（拖动时）显示 */
+@media (pointer: coarse) {
+  .messages-wrap:hover .custom-scrollbar {
+    opacity: 0;
+  }
+  /* 移动端滚动时用独立的类显示滑块，不走 .active */
+  .custom-scrollbar.scrolling {
+    opacity: 1;
+  }
+}
 .custom-scrollbar-thumb {
   position: absolute;
   right: 0;
@@ -388,6 +396,28 @@ body {
   cursor: grab;
 }
 .custom-scrollbar-thumb.dragging { cursor: grabbing; }
+/* 移动端触摸设备：加宽滑块与轨道，便于手指操作；默认隐藏，拖动时显示 */
+@media (pointer: coarse) {
+  .custom-scrollbar {
+    width: 18px;
+    right: 0;
+    opacity: 0;
+  }
+  .custom-scrollbar.active {
+    opacity: 1;
+  }
+  .custom-scrollbar-thumb {
+    width: 8px;
+    right: 5px;
+    min-height: 40px;
+    border-radius: 4px;
+  }
+  .custom-scrollbar-thumb:hover,
+  .custom-scrollbar-thumb.dragging {
+    width: 14px;
+    right: 2px;
+  }
+}
 .welcome-msg {
   text-align: center;
   margin: auto;
@@ -640,10 +670,64 @@ body {
   color: var(--text-primary);
   margin-bottom: 8px;
 }
+/* 左右分栏布局 */
+.ask-options-layout {
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+}
+.ask-options-layout.has-preview {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  grid-template-rows: auto auto;
+  gap: 8px;
+  align-items: start;
+}
 .ask-question-options {
   display: flex;
   flex-direction: column;
   gap: 6px;
+  grid-row: 1;
+  grid-column: 1;
+}
+/* 右侧预览区 */
+.ask-option-preview {
+  grid-row: 1;
+  grid-column: 2;
+  background: var(--bg-secondary);
+  border: 1px solid var(--border-color);
+  border-radius: 8px;
+  padding: 10px 12px;
+  font-size: 12px;
+  line-height: 1.6;
+  color: var(--text-secondary);
+  min-height: 60px;
+  transition: background 0.15s;
+  white-space: pre-wrap;
+  word-break: break-word;
+}
+/* 确认按钮 — 仅移动端 */
+.ask-confirm-btn {
+  display: none;
+  grid-row: 2;
+  grid-column: 1 / -1;
+  width: 100%;
+  padding: 9px 0;
+  border: 1.5px solid var(--accent);
+  border-radius: 8px;
+  background: transparent;
+  color: var(--accent);
+  font-size: 13px;
+  font-weight: 600;
+  cursor: pointer;
+  transition: background 0.12s, color 0.12s;
+}
+.ask-confirm-btn:active {
+  background: var(--accent);
+  color: #fff;
+}
+@media (pointer: coarse) {
+  .ask-confirm-btn { display: block; }
 }
 .ask-option-item {
   border: 1px solid var(--border-color);
@@ -659,6 +743,10 @@ body {
   background: var(--accent-light);
   border-color: var(--accent);
 }
+.ask-option-item.ask-option-selected {
+  background: var(--accent-light);
+  border-color: var(--accent);
+}
 .ask-option-label {
   font-size: 12px;
   font-weight: 600;