fix: 修复暗色主题下下拉菜单白色背景闪烁问题

- 添加 dark-select-dropdown 自定义类
- 修复鼠标移出后下拉菜单出现白色背景的问题
- 强制覆盖所有可能的白色背景样式

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/src/style.css

@@ -19,6 +19,27 @@ body {
   @apply bg-dark-900 text-gray-100 font-sans;
 }
 
+/* 自定义下拉菜单类 */
+.dark-select-dropdown {
+  background-color: #1a1c25 !important;
+  border: 1px solid #2a2c36 !important;
+}
+
+.dark-select-dropdown .el-select-dropdown__item {
+  color: #ffffff !important;
+  background-color: transparent !important;
+}
+
+.dark-select-dropdown .el-select-dropdown__item:hover,
+.dark-select-dropdown .el-select-dropdown__item.hover {
+  background-color: #1a1c25 !important;
+}
+
+.dark-select-dropdown .el-select-dropdown__item.is-selected {
+  color: #ff9500 !important;
+  background-color: transparent !important;
+}
+
 /* Element Plus 暗色主题 */
 html.dark {
   --el-bg-color: #171922;
@@ -129,6 +150,30 @@ html.dark .el-select-dropdown {
   box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
 }
 
+/* 修复鼠标移出后出现白色背景的问题 */
+html.dark .el-select-dropdown__list {
+  background-color: #1a1c25 !important;
+}
+
+html.dark .el-select-dropdown.is-multiple .el-select-dropdown__item.selected::after {
+  background-color: transparent;
+}
+
+html.dark .el-popper.is-light .el-popper__arrow::before,
+html.dark .el-select-dropdown__arrow {
+  background-color: #1a1c25 !important;
+}
+
+/* 强制覆盖所有可能的白色背景 */
+html.dark .el-select-dropdown__item.hover,
+html.dark .el-select-dropdown__item:hover {
+  background-color: #1a1c25 !important;
+}
+
+html.dark .el-select-dropdown.el-popper[x-placement^="bottom"] .el-select-dropdown__item {
+  background-color: #1a1c25 !important;
+}
+
 html.dark .el-select-dropdown__item {
   color: #ffffff !important;
   padding: 8px 12px;

web/src/views/Database.vue

@@ -807,7 +807,7 @@ const filteredDatabases = () => {
 
             <div>
               <label class="block text-sm font-medium text-gray-300 mb-2">Type</label>
-              <el-select v-model="editForm.db_type" placeholder="Select" class="w-full" size="large">
+              <el-select v-model="editForm.db_type" placeholder="Select" class="w-full" size="large" popper-class="dark-select-dropdown">
                 <el-option v-for="type in dbTypes" :key="type" :label="type" :value="type" />
               </el-select>
             </div>
@@ -924,7 +924,7 @@ const filteredDatabases = () => {
 
             <div>
               <label class="block text-sm font-medium text-gray-300 mb-2">Type</label>
-              <el-select v-model="newDbForm.db_type" placeholder="Select" class="w-full" size="large">
+              <el-select v-model="newDbForm.db_type" placeholder="Select" class="w-full" size="large" popper-class="dark-select-dropdown">
                 <el-option v-for="type in dbTypes" :key="type" :label="type" :value="type" />
               </el-select>
             </div>