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-tauri/src/commands/ai/audit/record.rs

@@ -184,7 +184,7 @@ pub async fn list_tool_executions(
     query: Option<ToolExecQuery>,
 ) -> Result<ToolExecutionPage, String> {
     let q = query.unwrap_or_default();
-    let limit = q.limit.unwrap_or(50);
+    let _limit = q.limit.unwrap_or(50);
     let offset = q.offset.unwrap_or(0);
     let audit_q = AuditQuery::from(q);