refactor(vscode-ide-companion/types): move ApprovalModeValue type to dedicated file

feat(vscode-ide-companion/file-context): improve file context handling and search

Enhance file context hook to better handle search queries and reduce redundant requests.
Track last query to optimize when to refetch full file list.
Improve logging for debugging purposes.

packages/vscode-ide-companion/src/webview/handlers/SessionMessageHandler.ts

@@ -7,6 +7,7 @@
 import * as vscode from 'vscode';
 import { BaseMessageHandler } from './BaseMessageHandler.js';
 import type { ChatMessage } from '../../services/qwenAgentManager.js';
+import type { ApprovalModeValue } from '../../types/approvalModeValueTypes.js';
 
 /**
  * Session message handler
@@ -29,6 +30,8 @@ export class SessionMessageHandler extends BaseMessageHandler {
       'cancelStreaming',
       // UI action: open a new chat tab (new WebviewPanel)
       'openNewChatTab',
+      // Settings-related messages
+      'setApprovalMode',
     ].includes(messageType);
   }
 
@@ -112,6 +115,14 @@ export class SessionMessageHandler extends BaseMessageHandler {
         await this.handleCancelStreaming();
         break;
 
+      case 'setApprovalMode':
+        await this.handleSetApprovalMode(
+          message.data as {
+            modeId?: ApprovalModeValue;
+          },
+        );
+        break;
+
       default:
         console.warn(
           '[SessionMessageHandler] Unknown message type:',
@@ -1073,4 +1084,23 @@ export class SessionMessageHandler extends BaseMessageHandler {
       }
     }
   }
+
+  /**
+   * Set approval mode via agent (ACP session/set_mode)
+   */
+  private async handleSetApprovalMode(data?: {
+    modeId?: ApprovalModeValue;
+  }): Promise<void> {
+    try {
+      const modeId = data?.modeId || 'default';
+      await this.agentManager.setApprovalModeFromUi(modeId);
+      // No explicit response needed; WebView listens for modeChanged
+    } catch (error) {
+      console.error('[SessionMessageHandler] Failed to set mode:', error);
+      this.sendToWebView({
+        type: 'error',
+        data: { message: `Failed to set mode: ${error}` },
+      });
+    }
+  }
 }