feat(vscode-ide-companion): 新增上下文附件管理功能

- 新增 ContextAttachmentManager 管理上下文附件
- 新增 ContextPills 组件用于显示上下文标签
- 支持文件、符号、选区等多种上下文类型

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

packages/vscode-ide-companion/src/webview/ContextAttachmentManager.ts

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+/**
+ * @license
+ * Copyright 2025 Qwen Team
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * Context attachment types
+ * Based on vscode-copilot-chat implementation
+ */
+export interface ContextAttachment {
+  id: string;
+  type: 'file' | 'symbol' | 'selection' | 'variable';
+  name: string;
+  value: string | { uri: string; range?: { start: number; end: number } };
+  icon?: string;
+}
+
+/**
+ * Manages context attachments for the chat
+ * Similar to ChatContextAttachments in vscode-copilot-chat
+ */
+export class ContextAttachmentManager {
+  private attachments: Map<string, ContextAttachment> = new Map();
+  private listeners: Array<(attachments: ContextAttachment[]) => void> = [];
+
+  /**
+   * Add a context attachment
+   */
+  addAttachment(attachment: ContextAttachment): void {
+    this.attachments.set(attachment.id, attachment);
+    this.notifyListeners();
+  }
+
+  /**
+   * Remove a context attachment
+   */
+  removeAttachment(id: string): void {
+    this.attachments.delete(id);
+    this.notifyListeners();
+  }
+
+  /**
+   * Get all attachments
+   */
+  getAttachments(): ContextAttachment[] {
+    return Array.from(this.attachments.values());
+  }
+
+  /**
+   * Check if an attachment exists
+   */
+  hasAttachment(id: string): boolean {
+    return this.attachments.has(id);
+  }
+
+  /**
+   * Clear all attachments
+   */
+  clearAttachments(): void {
+    this.attachments.clear();
+    this.notifyListeners();
+  }
+
+  /**
+   * Subscribe to attachment changes
+   */
+  subscribe(listener: (attachments: ContextAttachment[]) => void): () => void {
+    this.listeners.push(listener);
+    return () => {
+      const index = this.listeners.indexOf(listener);
+      if (index > -1) {
+        this.listeners.splice(index, 1);
+      }
+    };
+  }
+
+  /**
+   * Notify all listeners of changes
+   */
+  private notifyListeners(): void {
+    const attachments = this.getAttachments();
+    this.listeners.forEach((listener) => listener(attachments));
+  }
+
+  /**
+   * Get context for message sending
+   */
+  getContextForMessage(): Array<Record<string, unknown>> {
+    return this.getAttachments().map((att) => ({
+      id: att.id,
+      type: att.type,
+      name: att.name,
+      value: att.value,
+    }));
+  }
+}

packages/vscode-ide-companion/src/webview/components/ContextPills.css

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+/**
+ * @license
+ * Copyright 2025 Qwen Team
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+.context-pills-container {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 6px;
+  padding: 8px 12px;
+  background: var(--vscode-input-background, #3c3c3c);
+  border-bottom: 1px solid var(--vscode-input-border, #454545);
+}
+
+.context-pill {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  padding: 4px 8px 4px 6px;
+  background: var(--vscode-badge-background, #4d4d4d);
+  color: var(--vscode-badge-foreground, #ffffff);
+  border-radius: 12px;
+  font-size: 12px;
+  max-width: 200px;
+  transition: background-color 0.1s ease;
+}
+
+.context-pill:hover {
+  background: var(--vscode-badge-background, #5a5a5a);
+}
+
+.context-pill-icon {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 14px;
+  height: 14px;
+  flex-shrink: 0;
+}
+
+.context-pill-icon svg {
+  width: 14px;
+  height: 14px;
+}
+
+.context-pill-label {
+  flex: 1;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  line-height: 1.2;
+}
+
+.context-pill-remove {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 16px;
+  height: 16px;
+  padding: 0;
+  background: transparent;
+  border: none;
+  color: inherit;
+  cursor: pointer;
+  opacity: 0.7;
+  transition: opacity 0.1s ease;
+  flex-shrink: 0;
+}
+
+.context-pill-remove:hover {
+  opacity: 1;
+}
+
+.context-pill-remove svg {
+  width: 12px;
+  height: 12px;
+}
+

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

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+/**
+ * @license
+ * Copyright 2025 Qwen Team
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import type React from 'react';
+import type { ContextAttachment } from '../ContextAttachmentManager.js';
+import './ContextPills.css';
+
+interface ContextPillsProps {
+  attachments: ContextAttachment[];
+  onRemove: (id: string) => void;
+}
+
+/**
+ * Display attached context as pills/chips
+ * Similar to ChatContextAttachments UI in vscode-copilot-chat
+ */
+export const ContextPills: React.FC<ContextPillsProps> = ({
+  attachments,
+  onRemove,
+}) => {
+  if (attachments.length === 0) {
+    return null;
+  }
+
+  const getIcon = (type: string) => {
+    switch (type) {
+      case 'file':
+        return (
+          <svg
+            xmlns="http://www.w3.org/2000/svg"
+            viewBox="0 0 16 16"
+            fill="currentColor"
+          >
+            <path d="M5 3.5a.5.5 0 0 1 .5-.5h4a.5.5 0 0 1 0 1h-4a.5.5 0 0 1-.5-.5Zm0 2a.5.5 0 0 1 .5-.5h7a.5.5 0 0 1 0 1h-7a.5.5 0 0 1-.5-.5Zm0 2a.5.5 0 0 1 .5-.5h7a.5.5 0 0 1 0 1h-7a.5.5 0 0 1-.5-.5Zm0 2a.5.5 0 0 1 .5-.5h7a.5.5 0 0 1 0 1h-7a.5.5 0 0 1-.5-.5Z" />
+          </svg>
+        );
+      case 'symbol':
+        return (
+          <svg
+            xmlns="http://www.w3.org/2000/svg"
+            viewBox="0 0 16 16"
+            fill="currentColor"
+          >
+            <path d="M8 1a.5.5 0 0 1 .5.5v5.793l2.146-2.147a.5.5 0 0 1 .708.708l-3 3a.5.5 0 0 1-.708 0l-3-3a.5.5 0 1 1 .708-.708L7.5 7.293V1.5A.5.5 0 0 1 8 1Z" />
+          </svg>
+        );
+      case 'selection':
+        return (
+          <svg
+            xmlns="http://www.w3.org/2000/svg"
+            viewBox="0 0 16 16"
+            fill="currentColor"
+          >
+            <path d="M2 3.5a.5.5 0 0 1 .5-.5h11a.5.5 0 0 1 0 1h-11a.5.5 0 0 1-.5-.5Zm0 4a.5.5 0 0 1 .5-.5h7a.5.5 0 0 1 0 1h-7a.5.5 0 0 1-.5-.5Zm0 4a.5.5 0 0 1 .5-.5h9a.5.5 0 0 1 0 1h-9a.5.5 0 0 1-.5-.5Z" />
+          </svg>
+        );
+      default:
+        return (
+          <svg
+            xmlns="http://www.w3.org/2000/svg"
+            viewBox="0 0 16 16"
+            fill="currentColor"
+          >
+            <path d="M8 2a.5.5 0 0 1 .5.5V5h2.5a.5.5 0 0 1 0 1H8.5v2.5a.5.5 0 0 1-1 0V6H5a.5.5 0 0 1 0-1h2.5V2.5A.5.5 0 0 1 8 2Z" />
+          </svg>
+        );
+    }
+  };
+
+  return (
+    <div className="context-pills-container">
+      {attachments.map((attachment) => (
+        <div key={attachment.id} className="context-pill">
+          <div className="context-pill-icon">{getIcon(attachment.type)}</div>
+          <div className="context-pill-label">{attachment.name}</div>
+          <button
+            className="context-pill-remove"
+            onClick={() => onRemove(attachment.id)}
+            aria-label="Remove attachment"
+          >
+            <svg
+              xmlns="http://www.w3.org/2000/svg"
+              viewBox="0 0 16 16"
+              fill="currentColor"
+            >
+              <path d="M4.646 4.646a.5.5 0 0 1 .708 0L8 7.293l2.646-2.647a.5.5 0 0 1 .708.708L8.707 8l2.647 2.646a.5.5 0 0 1-.708.708L8 8.707l-2.646 2.647a.5.5 0 0 1-.708-.708L7.293 8 4.646 5.354a.5.5 0 0 1 0-.708Z" />
+            </svg>
+          </button>
+        </div>
+      ))}
+    </div>
+  );
+};