feat(engine): 添加MCP连接管理和工具集成功能

- 集成MCP连接管理器，支持MCP服务器连接
- 添加多种内置工具：ClarifyTool、CronTool、DelegateTool、ExecuteCodeTool、
  PatchFileTool、ProcessTool、SendMessageTool、SpawnTool、TerminalTool、
  TodoTool、WebFetchTool、WebSearchTool、WriteFileTool等
- 实现工具注册和装配功能
- 添加技能选择上下文参数
- 支持思考模式控制参数thinking_enabled

feat(coordinator): 重构任务执行计划器参数命名

- 将learning_candidate_enabled重命名为allow_candidate_generation
- 更新TeamGraphScheduler中的参数传递
- 修改LocalAgentRunner中的相关参数处理
- 更新README文档中的相应描述

refactor(context): 标准化工具调用参数格式

- 添加_json导入用于参数序列化
- 实现_provider_tool_calls方法标准化OpenAI兼容的工具调用载荷
- 修复工具调用中参数非字符串类型的序列化问题

refactor(session): 优化消息历史记录过滤逻辑

- 修改get_messages_as_conversation为基于运行状态过滤消息
- 排除未完成、失败或错误结束的运行记录
- 改进对话历史的可见性控制机制

fix(store): 修复FTS索引重建逻辑

- 添加异常处理防止FTS索引创建失败
- 实现_rebuild_fts_index方法重新构建全文搜索索引
- 优化索引触发器和表的维护流程

app-instance/frontend/components/ui/button.tsx

@@ -5,7 +5,7 @@ import { cva, type VariantProps } from 'class-variance-authority';
 import { cn } from '@/lib/utils';
 
 const buttonVariants = cva(
-  'inline-flex items-center justify-center whitespace-nowrap rounded-md text-sm font-medium ring-offset-background transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:pointer-events-none disabled:opacity-50',
+  'inline-flex items-center justify-center whitespace-nowrap rounded-full text-sm font-medium shadow-[0_1px_2px_rgba(0,0,0,0.04),0_6px_24px_rgba(0,0,0,0.03)] ring-offset-background transition-colors duration-150 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:pointer-events-none disabled:opacity-50',
   {
     variants: {
       variant: {
@@ -13,7 +13,7 @@ const buttonVariants = cva(
         destructive:
           'bg-destructive text-destructive-foreground hover:bg-destructive/90',
         outline:
-          'border border-input bg-background hover:bg-accent hover:text-accent-foreground',
+          'border border-transparent bg-secondary text-secondary-foreground hover:bg-accent hover:text-accent-foreground',
         secondary:
           'bg-secondary text-secondary-foreground hover:bg-secondary/80',
         ghost: 'hover:bg-accent hover:text-accent-foreground',

app-instance/frontend/components/ui/card.tsx

@@ -9,7 +9,7 @@ const Card = React.forwardRef<
   <div
     ref={ref}
     className={cn(
-      'rounded-lg border bg-card text-card-foreground shadow-sm',
+      'rounded-2xl border border-black/[0.04] bg-card/70 text-card-foreground shadow-[0_1px_2px_rgba(0,0,0,0.04),0_6px_24px_rgba(0,0,0,0.03)]',
       className
     )}
     {...props}

app-instance/frontend/components/ui/input.tsx

@@ -11,7 +11,7 @@ const Input = React.forwardRef<HTMLInputElement, InputProps>(
       <input
         type={type}
         className={cn(
-          'flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background file:border-0 file:bg-transparent file:text-sm file:font-medium file:text-foreground placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50',
+          'flex h-10 w-full rounded-lg border border-transparent bg-input px-3 py-2 text-sm ring-offset-background file:border-0 file:bg-transparent file:text-sm file:font-medium file:text-foreground placeholder:text-muted-foreground focus-visible:border-ring focus-visible:outline-none focus-visible:ring-4 focus-visible:ring-ring/10 disabled:cursor-not-allowed disabled:opacity-50',
           className
         )}
         ref={ref}

app-instance/frontend/components/ui/textarea.tsx

@@ -10,7 +10,7 @@ const Textarea = React.forwardRef<HTMLTextAreaElement, TextareaProps>(
     return (
       <textarea
         className={cn(
-          'flex min-h-[80px] w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50',
+          'flex min-h-[80px] w-full rounded-lg border border-transparent bg-input px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus-visible:border-ring focus-visible:outline-none focus-visible:ring-4 focus-visible:ring-ring/10 disabled:cursor-not-allowed disabled:opacity-50',
           className
         )}
         ref={ref}