feat: 长按对话弹出操作菜单 - 重命名/分享/置顶/删除

www/style.css

@@ -152,7 +152,7 @@ body {
 
 .conversation-item {
   display: flex;
-  flex-direction: column;
+  align-items: center;
   padding: 12px 16px;
   background: white;
   border: 1px solid var(--border-color);
@@ -160,6 +160,12 @@ body {
   cursor: pointer;
   transition: all 0.2s;
   position: relative;
+  gap: 8px;
+}
+
+.conversation-item.pinned {
+  border-color: var(--primary);
+  background: rgba(102, 126, 234, 0.08);
 }
 
 .conversation-item:hover {
@@ -171,43 +177,90 @@ body {
   background: rgba(102, 126, 234, 0.1);
 }
 
+.pin-icon {
+  font-size: 14px;
+}
+
 .conv-title {
   font-size: 16px;
   font-weight: 500;
   color: var(--text-color);
-  margin-bottom: 4px;
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
+  flex: 1;
 }
 
 .conv-meta {
   font-size: 12px;
   color: var(--text-light);
+  white-space: nowrap;
 }
 
-.conv-delete-btn {
-  position: absolute;
-  right: 12px;
-  top: 50%;
-  transform: translateY(-50%);
+/* 操作菜单 */
+.action-menu {
+  position: fixed;
+  bottom: 0;
+  left: 0;
+  right: 0;
   background: transparent;
-  border: none;
-  color: var(--text-light);
-  padding: 6px;
+  display: none;
+  z-index: 1000;
+}
+
+.action-menu.show {
+  display: block;
+}
+
+.action-menu-content {
+  background: white;
+  border-radius: 16px 16px 0 0;
+  padding: 16px;
+  box-shadow: 0 -4px 20px rgba(0,0,0,0.15);
+  animation: slideUp 0.2s ease;
+}
+
+@keyframes slideUp {
+  from { transform: translateY(100%); }
+  to { transform: translateY(0); }
+}
+
+.action-menu-item {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  padding: 14px 16px;
+  border-radius: 10px;
   cursor: pointer;
-  opacity: 0;
   transition: all 0.2s;
 }
 
-.conversation-item:hover .conv-delete-btn {
-  opacity: 1;
+.action-menu-item:hover {
+  background: rgba(102, 126, 234, 0.1);
 }
 
-.conv-delete-btn:hover {
+.action-menu-item:active {
+  background: rgba(102, 126, 234, 0.2);
+}
+
+.action-menu-item svg {
+  color: var(--primary);
+}
+
+.action-menu-item span {
+  font-size: 16px;
+  color: var(--text-color);
+}
+
+.action-menu-item.delete-action svg,
+.action-menu-item.delete-action span {
   color: #e53e3e;
 }
 
+.action-menu-item.delete-action:hover {
+  background: rgba(229, 62, 62, 0.1);
+}
+
 /* ==================== 对话页面 ==================== */
 
 #chatPage {