fix(case): 用例管理 Tab、自动化弹窗与日期筛选主题样式

- Tab 未选中项在深色/浅色下可读性修复
- 生成自动化用例弹窗独立深色样式（append-to-body）
- 创建时间日期范围与主题一致

Co-authored-by: Cursor <cursoragent@cursor.com>

src/components/TestPlatform/Case/CaseList.vue

@@ -36,7 +36,7 @@
         </el-form-item>
       </el-form>
 
-      <el-tabs v-model="activeTab" style="margin-top: 8px;">
+      <el-tabs v-model="activeTab" class="case-list-tabs" style="margin-top: 8px;">
         <el-tab-pane label="模块列表" name="modules">
           <div class="module-list-toolbar">
             <el-button
@@ -641,6 +641,7 @@
       :visible.sync="autoGenDialogVisible"
       width="560px"
       append-to-body
+      custom-class="case-auto-gen-dialog"
       @closed="resetAutoGenDialog">
       <el-form ref="autoGenFormRef" :model="autoGenForm" :rules="autoGenRules" label-width="120px" size="small">
         <el-form-item label="当前用例">
@@ -2578,7 +2579,6 @@ export default {
 }
 
 .auto-gen-case-title {
-  color: #f8fafc;
   font-weight: 500;
   line-height: 1.5;
   word-break: break-word;
@@ -2596,8 +2596,7 @@ body.theme-light .ai-gen-params-bar {
 
 body.theme-light .ai-gen-params-label,
 body.theme-light .ai-doc-block-title,
-body.theme-light .ai-case-table-title,
+body.theme-light .ai-case-table-title {
-body.theme-light .auto-gen-case-title {
   color: #0f172a;
 }
 
@@ -2665,3 +2664,130 @@ body.theme-light .mindmap-empty {
   color: #64748b;
 }
 </style>
+
+<!-- 非 scoped：Tab / append-to-body 弹窗 / 日期范围在深浅色下与整站一致 -->
+<style>
+.case-list-tabs .el-tabs__item {
+  color: #94a3b8;
+}
+
+.case-list-tabs .el-tabs__item:hover {
+  color: #cbd5e1;
+}
+
+.case-list-tabs .el-tabs__item.is-active {
+  color: #38bdf8;
+}
+
+.case-list-tabs .el-tabs__nav-wrap::after {
+  background-color: rgba(148, 163, 184, 0.18);
+}
+
+body.theme-light .case-list-tabs .el-tabs__item {
+  color: #64748b;
+}
+
+body.theme-light .case-list-tabs .el-tabs__item:hover {
+  color: #334155;
+}
+
+body.theme-light .case-list-tabs .el-tabs__item.is-active {
+  color: #2563eb;
+}
+
+body.theme-light .case-list-tabs .el-tabs__nav-wrap::after {
+  background-color: #e2e8f0;
+}
+
+.el-dialog.case-auto-gen-dialog {
+  background: #111827;
+  border: 1px solid rgba(148, 163, 184, 0.2);
+}
+
+.el-dialog.case-auto-gen-dialog .el-dialog__header {
+  border-bottom: 1px solid rgba(148, 163, 184, 0.16);
+}
+
+.el-dialog.case-auto-gen-dialog .el-dialog__title,
+.el-dialog.case-auto-gen-dialog .el-dialog__body,
+.el-dialog.case-auto-gen-dialog .el-form-item__label {
+  color: #e5e7eb;
+}
+
+.el-dialog.case-auto-gen-dialog .auto-gen-case-title {
+  color: #f1f5f9;
+}
+
+.el-dialog.case-auto-gen-dialog .el-input__inner,
+.el-dialog.case-auto-gen-dialog .el-textarea__inner,
+.el-dialog.case-auto-gen-dialog .el-select .el-input__inner {
+  background-color: #0f172a;
+  border-color: rgba(148, 163, 184, 0.28);
+  color: #f8fafc;
+}
+
+.el-dialog.case-auto-gen-dialog .el-input__inner::placeholder,
+.el-dialog.case-auto-gen-dialog .el-textarea__inner::placeholder {
+  color: #64748b;
+}
+
+body.theme-light .el-dialog.case-auto-gen-dialog {
+  background: #ffffff;
+  border-color: #e5e7eb;
+}
+
+body.theme-light .el-dialog.case-auto-gen-dialog .el-dialog__header {
+  border-bottom-color: #ebeef5;
+}
+
+body.theme-light .el-dialog.case-auto-gen-dialog .el-dialog__title,
+body.theme-light .el-dialog.case-auto-gen-dialog .el-dialog__body,
+body.theme-light .el-dialog.case-auto-gen-dialog .el-form-item__label {
+  color: #303133;
+}
+
+body.theme-light .el-dialog.case-auto-gen-dialog .auto-gen-case-title {
+  color: #0f172a;
+}
+
+body.theme-light .el-dialog.case-auto-gen-dialog .el-input__inner,
+body.theme-light .el-dialog.case-auto-gen-dialog .el-textarea__inner,
+body.theme-light .el-dialog.case-auto-gen-dialog .el-select .el-input__inner {
+  background-color: #ffffff;
+  border-color: #dcdfe6;
+  color: #606266;
+}
+
+.page-wrap .el-date-editor .el-input__inner {
+  background-color: #0f172a;
+  border-color: rgba(148, 163, 184, 0.28);
+  color: #f8fafc;
+}
+
+.page-wrap .el-date-editor .el-range-input {
+  background-color: transparent;
+  color: #f8fafc;
+}
+
+.page-wrap .el-date-editor .el-range-separator {
+  color: #94a3b8;
+}
+
+.page-wrap .el-date-editor .el-range-input::placeholder {
+  color: #64748b;
+}
+
+body.theme-light .page-wrap .el-date-editor .el-input__inner {
+  background-color: #ffffff;
+  border-color: #dcdfe6;
+  color: #606266;
+}
+
+body.theme-light .page-wrap .el-date-editor .el-range-input {
+  color: #606266;
+}
+
+body.theme-light .page-wrap .el-date-editor .el-range-separator {
+  color: #909399;
+}
+</style>