refactor(vscode): 重构消息排序和展示逻辑

- 移除旧的消息排序改进总结文档
- 重新组织消息渲染逻辑，合并所有类型的消息按时间戳排序
- 优化工具调用处理流程，添加时间戳支持
- 改进会话保存机制，直接使用SessionManager保存检查点
- 重构部分组件以提高可维护性

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

@@ -36,7 +36,7 @@ const mapToolStatusToBullet = (
   }
 };
 
-// 从文本中尽可能解析带有 - [ ] / - [x] 的 todo 列表
+// Parse todo list with - [ ] / - [x] from text as much as possible
 const parseTodoEntries = (textOutputs: string[]): TodoEntry[] => {
   const text = textOutputs.join('\n');
   const lines = text.split(/\r?\n/);
@@ -60,7 +60,7 @@ const parseTodoEntries = (textOutputs: string[]): TodoEntry[] => {
     }
   }
 
-  // 如果没匹配到，退化为将非空行当作 pending 条目
+  // If no match is found, fall back to treating non-empty lines as pending items
   if (entries.length === 0) {
     for (const line of lines) {
       const title = line.trim();
@@ -83,7 +83,7 @@ export const TodoWriteToolCall: React.FC<BaseToolCallProps> = ({
   const { content, status } = toolCall;
   const { errors, textOutputs } = groupContent(content);
 
-  // 错误优先展示
+  // Error-first display
   if (errors.length > 0) {
     return (
       <ToolCallContainer label="Update Todos" status="error">

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

@@ -29,7 +29,7 @@ interface DiffDisplayProps {
   oldText?: string | null;
   newText?: string;
   onOpenDiff?: () => void;
-  /** 是否显示统计信息 */
+  /** Whether to display statistics */
   showStats?: boolean;
 }
 
@@ -44,13 +44,13 @@ export const DiffDisplay: React.FC<DiffDisplayProps> = ({
   onOpenDiff,
   showStats = true,
 }) => {
-  // 统计信息（仅在文本变化时重新计算）
+  // Statistics (recalculate only when text changes)
   const stats = useMemo(
     () => calculateDiffStats(oldText, newText),
     [oldText, newText],
   );
 
-  // 仅生成变更行（增加/删除），不渲染上下文
+  // Only generate changed lines (additions/deletions), do not render context
   const ops: DiffOp[] = useMemo(
     () => computeLineDiff(oldText, newText),
     [oldText, newText],
@@ -106,7 +106,7 @@ export const DiffDisplay: React.FC<DiffDisplayProps> = ({
         </div>
       </div>
 
-      {/* 只绘制差异行的预览区域 */}
+      {/* Only draw preview area for diff lines */}
       <pre className="diff-preview code-block" aria-label="Diff preview">
         <div className="code-content">
           {previewOps.length === 0 && (
@@ -142,7 +142,7 @@ export const DiffDisplay: React.FC<DiffDisplayProps> = ({
         </div>
       </pre>
 
-      {/* 在预览下方提供显式打开按钮（可选） */}
+      {/* Provide explicit open button below preview (optional) */}
       {onOpenDiff && (
         <div className="diff-compact-actions">
           <button

packages/vscode-ide-companion/src/webview/components/toolcalls/shared/types.ts

@@ -48,7 +48,7 @@ export interface ToolCallData {
   rawInput?: string | object;
   content?: ToolCallContent[];
   locations?: ToolCallLocation[];
-  timestamp?: number; // 添加时间戳字段用于消息排序
+  timestamp?: number; // Add a timestamp field for message sorting
 }
 
 /**