优化: UI/UX遗留批(审计/AI命令层/前端组件,会话前基线收尾)

- AuditLog +298(筛选/详情/i18n)+ audit 后端 record/mod

- AI 命令层:generate_image +81 / fetch_url / fetch_search / skills / tool_registry / tools/file / provider / conversation

- 前端组件:AiChat/TopBar/ConversationSidebar/GitChanges/ApprovalPopup/Dashboard/ProjectDetail 等 30+ + composables + i18n

- 诊断文档: aichat历史会话实证诊断-2026-08-04 + project_soft_delete 测试

src/components/ai/ApprovalOverlay.vue

@@ -123,7 +123,7 @@ function onDismiss() {
   border: 0.5px solid var(--df-accent);
   border-left: 3px solid var(--df-accent);
   border-radius: var(--df-radius-md);
-  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(123, 111, 240, 0.2);
+  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 0 1px var(--df-accent-soft);
   cursor: pointer;
   transition: all 0.18s var(--df-ease);
   user-select: none;
@@ -155,7 +155,7 @@ function onDismiss() {
   min-width: 18px;
   height: 18px;
   padding: 0 5px;
-  border-radius: 9px;
+  border-radius: 8px;
   background: var(--df-danger);
   color: #fff;
   font-size: 10px;