fix: add thread safety for concurrent state modifications

- Add stateLock to synchronize all getState/setState read-modify-write
  operations across UI thread and AgentLoop background threads
- Synchronize onInput, onPaste, addMessage, appendToStreamingMessage,
  finishStreamingMessage, completeLastToolCall, setThinking, runAgent
- Extract addMessageInternal() to avoid double-locking
- Harden extractToolSummary with explicit indexOf checks

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/main/java/com/claudecode/tui/ClaudeCodeComponent.java

@@ -71,6 +71,7 @@ public class ClaudeCodeComponent extends Component<ClaudeCodeComponent.TuiState>
     private final Runnable onExit;
 
     // --- 内部状态 ---
+    private final Object stateLock = new Object(); // 保护 getState/setState 的读-改-写操作
     private final List<String> inputHistory = new ArrayList<>();
     private int historyIndex = -1;
     private String savedInput = "";
@@ -441,6 +442,7 @@ public class ClaudeCodeComponent extends Component<ClaudeCodeComponent.TuiState>
 
     @Override
     public void onInput(String input, Key key) {
+        synchronized (stateLock) {
             TuiState s = getState();
 
             // Ctrl+D: 退出
@@ -453,7 +455,7 @@ public class ClaudeCodeComponent extends Component<ClaudeCodeComponent.TuiState>
             if (key.ctrl() && "c".equals(input)) {
                 if (agentRunning.get()) {
                     // TODO: 中断 Agent 运行
-                addMessage(new SystemMsg("^C (interrupt)", Color.BRIGHT_YELLOW));
+                    addMessageInternal(new SystemMsg("^C (interrupt)", Color.BRIGHT_YELLOW), s);
                 } else {
                     setState(new TuiState("", s.messages, s.scrollOffset, false, ""));
                 }
@@ -506,14 +508,17 @@ public class ClaudeCodeComponent extends Component<ClaudeCodeComponent.TuiState>
                 setState(new TuiState(s.inputText + input, s.messages, s.scrollOffset, false, ""));
             }
         }
+    }
 
     @Override
     public void onPaste(String text) {
+        synchronized (stateLock) {
             if (agentRunning.get() || text == null || text.isEmpty()) return;
             TuiState s = getState();
             abandonHistoryPreview();
             setState(new TuiState(s.inputText + text, s.messages, s.scrollOffset, false, ""));
         }
+    }
 
     /** 处理权限确认输入 */
     private void handlePermissionInput(String input, Key key, TuiState s) {
@@ -605,9 +610,11 @@ public class ClaudeCodeComponent extends Component<ClaudeCodeComponent.TuiState>
                 addMessage(new SystemMsg("Error: " + e.getMessage(), Color.BRIGHT_RED));
             } finally {
                 agentRunning.set(false);
+                synchronized (stateLock) {
                     TuiState cs = getState();
                     setState(new TuiState(cs.inputText, cs.messages, 0, false, ""));
                 }
+            }
         });
     }
 
@@ -615,7 +622,13 @@ public class ClaudeCodeComponent extends Component<ClaudeCodeComponent.TuiState>
 
     /** 添加一条消息 */
     public void addMessage(UIMessage msg) {
-        TuiState s = getState();
+        synchronized (stateLock) {
+            addMessageInternal(msg, getState());
+        }
+    }
+
+    /** 内部添加消息（调用方需持有 stateLock） */
+    private void addMessageInternal(UIMessage msg, TuiState s) {
         List<UIMessage> newMsgs = new ArrayList<>(s.messages);
         newMsgs.add(msg);
         setState(new TuiState(s.inputText, Collections.unmodifiableList(newMsgs),
@@ -624,6 +637,7 @@ public class ClaudeCodeComponent extends Component<ClaudeCodeComponent.TuiState>
 
     /** 追加 token 到当前流式助手消息 */
     private void appendToStreamingMessage(String token) {
+        synchronized (stateLock) {
             TuiState s = getState();
             List<UIMessage> msgs = new ArrayList<>(s.messages);
 
@@ -637,9 +651,11 @@ public class ClaudeCodeComponent extends Component<ClaudeCodeComponent.TuiState>
             setState(new TuiState(s.inputText, Collections.unmodifiableList(msgs),
                     0, s.thinking, s.thinkingText));
         }
+    }
 
     /** 完成当前流式消息（公开给 JinkReplSession 使用） */
     public void finishStreamingMessage() {
+        synchronized (stateLock) {
             TuiState s = getState();
             List<UIMessage> msgs = new ArrayList<>(s.messages);
 
@@ -649,9 +665,11 @@ public class ClaudeCodeComponent extends Component<ClaudeCodeComponent.TuiState>
                         0, s.thinking, s.thinkingText));
             }
         }
+    }
 
     /** 更新最后一个工具调用消息的结果 */
     public void completeLastToolCall(String result) {
+        synchronized (stateLock) {
             TuiState s = getState();
             List<UIMessage> msgs = new ArrayList<>(s.messages);
 
@@ -665,6 +683,7 @@ public class ClaudeCodeComponent extends Component<ClaudeCodeComponent.TuiState>
             setState(new TuiState(s.inputText, Collections.unmodifiableList(msgs),
                     s.scrollOffset, s.thinking, s.thinkingText));
         }
+    }
 
     /** 设置权限确认回调 */
     public void requestPermission(Consumer<String> callback) {
@@ -673,9 +692,11 @@ public class ClaudeCodeComponent extends Component<ClaudeCodeComponent.TuiState>
 
     /** 设置 thinking 状态 */
     public void setThinking(boolean thinking, String text) {
+        synchronized (stateLock) {
             TuiState s = getState();
             setState(new TuiState(s.inputText, s.messages, s.scrollOffset, thinking, text));
         }
+    }
 
     /** 设置首次用户输入回调 */
     public void setOnFirstUserInput(Consumer<String> callback) {
@@ -747,11 +768,13 @@ public class ClaudeCodeComponent extends Component<ClaudeCodeComponent.TuiState>
             String[] keys = {"command", "file_path", "pattern", "query", "url"};
             for (String key : keys) {
                 String search = "\"" + key + "\"";
-                if (args.contains(search)) {
                 int start = args.indexOf(search);
-                    int valStart = args.indexOf("\"", start + search.length()) + 1;
+                if (start < 0) continue;
+                int colonPos = args.indexOf("\"", start + search.length());
+                if (colonPos < 0) continue;
+                int valStart = colonPos + 1;
                 int valEnd = args.indexOf("\"", valStart);
-                    if (valStart > 0 && valEnd > valStart) {
+                if (valEnd < 0 || valEnd <= valStart) continue;
                 String val = args.substring(valStart, Math.min(valEnd, valStart + 60));
                 return switch (key) {
                     case "command" -> "$ " + val;
@@ -760,8 +783,6 @@ public class ClaudeCodeComponent extends Component<ClaudeCodeComponent.TuiState>
                     default -> val;
                 };
             }
-                }
-            }
         } catch (Exception ignored) {}
         return null;
     }