feat: improve VS Code editor chat actions

Targets active editor chat before falling back to sidebar
Adds session open-in-editor action in the VS Code sidebar
Uses attachment badges for VS Code file and selection context

packages/vscode/src/ChatViewProvider.ts

@@ -199,6 +199,37 @@ export class ChatViewProvider implements vscode.WebviewViewProvider {
     }
   }
 
+  public addContextSelection(selection: { filePath: string; filename: string; text: string }) {
+    if (!this._view) {
+      return;
+    }
+
+    this._view.show(true);
+    this._view.webview.postMessage({
+      type: 'command',
+      command: 'addContextSelection',
+      payload: selection,
+    });
+  }
+
+  public addFileAttachments(files: Array<{ filePath: string; fileName: string; fileSize: number | null }>) {
+    if (!this._view) {
+      return;
+    }
+
+    const cleanedFiles = files.filter((entry) => entry.filePath.trim().length > 0 && entry.fileName.trim().length > 0);
+    if (cleanedFiles.length === 0) {
+      return;
+    }
+
+    this._view.show(true);
+    this._view.webview.postMessage({
+      type: 'command',
+      command: 'addFileAttachments',
+      payload: { files: cleanedFiles },
+    });
+  }
+
   public addFileMentions(paths: string[]) {
     if (!this._view) {
       return;