feat: 优化手机端UI布局和样式

- 手机端对话内容左右边距减小，AI消息更贴近屏幕边缘
- 修复工具intent文本溢出显示省略号，保持箭头和图标位置不变
- 重构手机端左上角菜单为纵向下拉样式，新增"新建对话"选项
- 统一菜单图标大小和线条粗细，支持亮色/暗色主题自动适配
- 修复个人空间弹窗顶部被状态栏遮挡问题

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

static/src/App.vue

@@ -376,31 +376,53 @@
           </div>
         </div>
         <transition name="mobile-panel-menu">
-          <div v-if="mobileOverlayMenuOpen" class="mobile-panel-menu">
+          <div v-if="mobileOverlayMenuOpen" class="mobile-panel-menu mobile-panel-menu--dropdown">
             <button
               type="button"
-              class="mobile-menu-btn mobile-menu-btn--conversation"
+              class="dropdown-item mobile-menu-item"
               aria-label="对话记录"
               @click="openMobileOverlay('conversation')"
             >
-              <svg class="mobile-menu-svg" viewBox="0 0 28 28" fill="none" aria-hidden="true">
+              <svg class="mobile-menu-icon" viewBox="0 0 24 24" fill="none" aria-hidden="true">
                 <path
-                  d="M5 6.5c0-1.38 1.12-2.5 2.5-2.5h13c1.38 0 2.5 1.12 2.5 2.5v8.5c0 1.38-1.12 2.5-2.5 2.5h-5.6l-3.4 3.2.6-3.2H7.5c-1.38 0-2.5-1.12-2.5-2.5V6.5z"
+                  d="M4 5.5c0-1.38 1.12-2.5 2.5-2.5h11c1.38 0 2.5 1.12 2.5 2.5v7.5c0 1.38-1.12 2.5-2.5 2.5h-4.8l-2.9 2.7.5-2.7H6.5c-1.38 0-2.5-1.12-2.5-2.5V5.5z"
                   fill="none"
                   stroke="currentColor"
-                  stroke-width="1.9"
+                  stroke-width="1.7"
                   stroke-linecap="round"
                   stroke-linejoin="round"
                 />
-                <path d="M9 9.5h10" stroke="currentColor" stroke-width="1.9" stroke-linecap="round" />
+                <path d="M8 8.5h8" stroke="currentColor" stroke-width="1.7" stroke-linecap="round" />
-                <path d="M9 13h6" stroke="currentColor" stroke-width="1.9" stroke-linecap="round" />
+                <path d="M8 11.5h5" stroke="currentColor" stroke-width="1.7" stroke-linecap="round" />
               </svg>
+              <div class="item-label">对话记录</div>
             </button>
-            <button type="button" class="mobile-menu-btn" aria-label="工作台" @click="openMobileOverlay('workspace')">
+            <button
-              <img :src="mobileMenuIcons.workspace" alt="" aria-hidden="true" />
+              type="button"
+              class="dropdown-item mobile-menu-item"
+              aria-label="工作文件"
+              @click="openMobileOverlay('workspace')"
+            >
+              <img class="mobile-menu-icon" :src="mobileMenuIcons.workspace" alt="" aria-hidden="true" />
+              <div class="item-label">工作文件</div>
             </button>
-            <button type="button" class="mobile-menu-btn" aria-label="个人空间" @click="handleMobilePersonalClick">
+            <button
-              <img :src="mobileMenuIcons.personal" alt="" aria-hidden="true" />
+              type="button"
+              class="dropdown-item mobile-menu-item"
+              aria-label="个人空间"
+              @click="handleMobilePersonalClick"
+            >
+              <img class="mobile-menu-icon" :src="mobileMenuIcons.personal" alt="" aria-hidden="true" />
+              <div class="item-label">个人空间</div>
+            </button>
+            <button
+              type="button"
+              class="dropdown-item mobile-menu-item"
+              aria-label="新建对话"
+              @click="createNewConversation"
+            >
+              <img class="mobile-menu-icon" :src="mobileMenuIcons.newChat" alt="" aria-hidden="true" />
+              <div class="item-label">新建对话</div>
             </button>
           </div>
         </transition>
@@ -514,7 +536,8 @@ import VideoPicker from './components/overlay/VideoPicker.vue';
 const mobilePanelIcon = new URL('../icons/align-left.svg', import.meta.url).href;
 const mobileMenuIcons = {
   workspace: new URL('../icons/folder.svg', import.meta.url).href,
-  personal: new URL('../icons/user.svg', import.meta.url).href
+  personal: new URL('../icons/user.svg', import.meta.url).href,
+  newChat: new URL('../icons/pencil.svg', import.meta.url).href
 };
 
 defineOptions(appOptions);

static/src/styles/components/chat/_chat-area.scss

@@ -140,11 +140,25 @@
 
     .messages-area {
         padding-top: 8px;
+        padding-left: 12px !important;
+        padding-right: 12px !important;
     }
 
     .message-block:first-child {
         margin-top: 0;
     }
+
+    .assistant-message .message-text {
+        padding: 16px 8px !important;
+    }
+}
+
+/* 额外的手机端样式，不依赖 mobile 类 */
+@media (max-width: 768px) {
+    .messages-flow {
+        padding-left: 0;
+        padding-right: 0;
+    }
 }
 
 .conversation-ribbon__selector {
@@ -747,7 +761,7 @@ body[data-theme='dark'] .more-icon {
     white-space: nowrap;
     overflow: hidden;
     text-overflow: ellipsis;
-    flex-shrink: 1;
+    flex: 1;
     min-width: 0;
 }
 

static/src/styles/components/overlays/_overlays.scss

@@ -370,6 +370,7 @@
         max-height: none;
         border-radius: 0;
         padding: 16px;
+        padding-top: 60px;
         display: flex;
         flex-direction: column;
     }
@@ -1515,6 +1516,70 @@
     align-self: flex-start;
 }
 
+/* 新的下拉菜单样式 */
+.mobile-panel-menu--dropdown {
+    position: fixed;
+    top: 52px;
+    left: 12px;
+    display: flex;
+    flex-direction: column;
+    gap: 6px;
+    padding: 12px;
+    border-radius: 14px;
+    background: rgba(255, 255, 255, 0.96);
+    box-shadow: 0 18px 48px rgba(15, 23, 42, 0.18);
+    backdrop-filter: blur(8px);
+    min-width: 200px;
+    z-index: 1600;
+}
+
+.mobile-menu-item {
+    display: flex;
+    align-items: center;
+    gap: 12px;
+    padding: 10px 12px;
+    border-radius: 12px;
+    background: transparent;
+    border: 1px solid transparent;
+    cursor: pointer;
+    transition: all 0.18s ease;
+    color: #0f172a;
+    text-align: left;
+}
+
+.mobile-menu-item:hover {
+    background: #f6f7fb;
+}
+
+.mobile-menu-item .item-label {
+    font-size: 14px;
+    font-weight: 500;
+    flex: 1;
+}
+
+/* 统一所有图标容器宽度为 30px，确保文字左对齐 */
+.mobile-menu-icon {
+    width: 24px !important;
+    height: 24px !important;
+    min-width: 30px;
+    max-width: 30px;
+    flex-shrink: 0;
+    display: block;
+}
+
+/* 对话记录图标特殊尺寸，但容器宽度保持 30px */
+.mobile-menu-item:nth-child(1) svg.mobile-menu-icon {
+    width: 30px !important;
+    height: 30px !important;
+    margin-top: 2px;
+}
+
+/* 个人空间图标稍大一点 */
+.mobile-menu-item:nth-child(3) img.mobile-menu-icon {
+    width: 26px !important;
+    height: 26px !important;
+}
+
 .mobile-topbar-title {
     flex: 1;
     font-size: 14px;
@@ -1661,6 +1726,7 @@
     border-radius: 0;
     box-shadow: none;
     padding: 0;
+    padding-top: 44px;
     position: relative;
     overflow: hidden;
     display: flex;
@@ -1695,7 +1761,7 @@
     margin-top: 0;
     flex: 1;
     width: 100%;
-    height: 100%;
+    height: calc(100% - 44px);
     overflow: hidden;
 }
 
@@ -2941,6 +3007,25 @@ body[data-theme='dark'] {
         background: #000000 !important;
     }
 
+    /* 新的下拉菜单样式 - 暗色主题 */
+    .mobile-panel-menu--dropdown {
+        background: #2a2a2a !important;
+        box-shadow: 0 18px 48px rgba(0, 0, 0, 0.5) !important;
+    }
+
+    .mobile-menu-item {
+        color: #ffffff !important;
+    }
+
+    .mobile-menu-item:hover {
+        background: #3a3a3a !important;
+    }
+
+    /* 图标颜色反转为白色 */
+    .mobile-menu-icon {
+        filter: brightness(0) invert(1) !important;
+    }
+
     /* 手机端菜单按钮 - SVG 白色 */
     .mobile-menu-btn {
         color: #ffffff !important;