fix(vscode-ide-companion): improve type safety in webview components

修复 webview 组件的类型安全问题：
- App.tsx: 规范化工具调用状态为联合类型
- InProgressToolCall.tsx: 安全处理非字符串类型的 title 属性
- InputForm.tsx: 修正 RefObject 泛型类型声明
- ReadToolCall.tsx: 添加空 children 避免 ToolCallContainer 警告

packages/vscode-ide-companion/src/webview/components/InProgressToolCall.tsx

@@ -68,6 +68,12 @@ export const InProgressToolCall: React.FC<InProgressToolCallProps> = ({
   // Get status text
   const statusText = getStatusText(status || 'in_progress');
 
+  // Safely prepare a display value for title. Titles may sometimes arrive as
+  // non-string objects; ensure we render a string in that case.
+  const titleText = typeof title === 'string' ? title : undefined;
+  const titleDisplay: React.ReactNode =
+    typeof title === 'string' ? title : title ? JSON.stringify(title) : null;
+
   return (
     <div className="in-progress-tool-call">
       <div className="in-progress-tool-call-header">
@@ -79,8 +85,8 @@ export const InProgressToolCall: React.FC<InProgressToolCallProps> = ({
         </span>
       </div>
 
-      {title && title !== kindLabel && (
-        <div className="in-progress-tool-call-title">{title}</div>
+      {titleDisplay && (titleText ? titleText !== kindLabel : true) && (
+        <div className="in-progress-tool-call-title">{titleDisplay}</div>
       )}
 
       {locations && locations.length > 0 && (

packages/vscode-ide-companion/src/webview/components/InputForm.tsx

@@ -10,7 +10,9 @@ type EditMode = 'ask' | 'auto' | 'plan';
 
 interface InputFormProps {
   inputText: string;
-  inputFieldRef: React.RefObject<HTMLDivElement | null>;
+  // Note: RefObject<T> carries nullability in its `current` property, so the
+  // generic should be `HTMLDivElement` (not `HTMLDivElement | null`).
+  inputFieldRef: React.RefObject<HTMLDivElement>;
   isStreaming: boolean;
   isComposing: boolean;
   editMode: EditMode;

packages/vscode-ide-companion/src/webview/components/toolcalls/ReadToolCall.tsx

@@ -48,7 +48,9 @@ export const ReadToolCall: React.FC<BaseToolCallProps> = ({ toolCall }) => {
         label={`Read ${fileName}`}
         status="success"
         toolCallId={toolCallId}
-      />
+      >
+        {null}
+      </ToolCallContainer>
     );
   }