fix(mcp-client): 增强协议版本校验和JSON-RPC批处理支持

- 在初始化时验证服务器返回的MCP协议版本，拒绝不支持的版本
- 支持处理JSON-RPC批量消息，逐条分发处理
- 抽离单条消息处理逻辑，统一处理通知和响应
- 防止通知处理器异常导致读取循环崩溃

fix(ui): 优化键盘交互提示与布局间距

- 移除Esc键作为取消操作，避免与Ctrl+C冲突
- 更新底部提示，明确Ctrl+C为关闭操作，Esc为返回操作
- 调整MessageView内容左边距，使间距更合理

Author: hqwlkj

src/mcp/mcp-client.ts

@@ -178,7 +178,19 @@ export class McpClient {
         },
         timeoutMs
       )
-        .then(() => {
+        .then((result) => {
+          // Validate protocol version from server response (per MCP spec §4.2.1.2)
+          const initResult = result as { protocolVersion?: string } | undefined;
+          const serverVersion = initResult?.protocolVersion;
+          if (serverVersion && serverVersion !== "2025-03-26" && serverVersion !== "2024-11-05") {
+            reject(
+              new Error(
+                `Unsupported MCP protocol version "${serverVersion}" from server "${this.serverName}". ` +
+                  `Client supports 2025-03-26 and 2024-11-05.`
+              )
+            );
+            return;
+          }
           // Send initialized notification
           this.sendNotification("notifications/initialized");
           resolve();
@@ -302,36 +314,54 @@ export class McpClient {
     try {
       const parsed: unknown = JSON.parse(line);
 
-      // Handle notifications (no id field — server-initiated)
-      if (parsed && typeof parsed === "object" && !("id" in parsed)) {
-        const notification = parsed as JsonRpcNotification;
-        if (this.notificationHandler && typeof notification.method === "string") {
-          try {
-            this.notificationHandler(notification.method, notification.params);
-          } catch {
-            // Swallow handler errors to avoid crashing the reader loop
+      // Handle JSON-RPC batch (array of requests/notifications/responses)
+      // Per MCP 2025-03-26 §4.1.1.3: implementations MUST support receiving batches.
+      if (Array.isArray(parsed)) {
+        for (const item of parsed) {
+          if (item && typeof item === "object") {
+            this.handleSingleMessage(item);
           }
         }
         return;
       }
 
-      // Handle responses to our requests
-      const message = parsed as JsonRpcResponse;
-      if (message.id !== undefined && this.pendingRequests.has(message.id)) {
-        const pending = this.pendingRequests.get(message.id)!;
-        this.pendingRequests.delete(message.id);
-        clearTimeout(pending.timer);
-        if (message.error) {
-          pending.reject(this.withStderr(`MCP error: ${message.error.message}`));
-        } else {
-          pending.resolve(message.result);
-        }
+      // Handle single message
+      if (parsed && typeof parsed === "object") {
+        this.handleSingleMessage(parsed);
       }
     } catch {
       // Ignore unparseable lines
     }
   }
 
+  private handleSingleMessage(msg: object): void {
+    // Handle notifications (no id field — server-initiated)
+    if (!("id" in msg)) {
+      const notification = msg as unknown as JsonRpcNotification;
+      if (this.notificationHandler && typeof notification.method === "string") {
+        try {
+          this.notificationHandler(notification.method, notification.params);
+        } catch {
+          // Swallow handler errors to avoid crashing the reader loop
+        }
+      }
+      return;
+    }
+
+    // Handle responses to our requests
+    const message = msg as unknown as JsonRpcResponse;
+    if (message.id !== undefined && this.pendingRequests.has(message.id)) {
+      const pending = this.pendingRequests.get(message.id)!;
+      this.pendingRequests.delete(message.id);
+      clearTimeout(pending.timer);
+      if (message.error) {
+        pending.reject(this.withStderr(`MCP error: ${message.error.message}`));
+      } else {
+        pending.resolve(message.result);
+      }
+    }
+  }
+
   private withNpxYesArg(command: string, args: string[]): string[] {
     const executable = path
       .basename(command)

src/ui/McpStatusList.tsx

@@ -356,7 +356,7 @@ function ServerDetailView({
   const visibleItems = allItems.slice(visibleStart, visibleStart + maxVisible);
 
   useInput((input, key) => {
-    if (key.escape || (key.ctrl && (input === "c" || input === "C"))) {
+    if (key.ctrl && (input === "c" || input === "C")) {
       onCancel();
       return;
     }
@@ -466,7 +466,7 @@ function ServerDetailView({
         </Box>
         {/* Footer */}
         <Box paddingX={1}>
-          <Text dimColor>↑/↓ scroll · Space/Enter back · Esc close</Text>
+          <Text dimColor>↑/↓ scroll · Space/Enter back · Esc back · Ctrl+C close</Text>
         </Box>
       </Box>
     </Box>

src/ui/MessageView.tsx

@@ -47,7 +47,7 @@ export function MessageView({ message, collapsed, width = 80 }: Props): React.Re
       return (
         <Box marginLeft={1} flexDirection="column" marginY={0}>
           <StatusLine bulletColor="gray" name="Thinking" params={summary} />
-          <Box flexDirection="column" marginLeft={4}>
+          <Box flexDirection="column" marginLeft={2}>
             {content ? <Text dimColor>{renderMarkdown(content)}</Text> : null}
           </Box>
         </Box>