Add support for changing working dir and extensions in same window/session (#6057)

ui/desktop/src/utils/extensionErrorUtils.ts

@@ -2,6 +2,9 @@
  * Shared constants and utilities for extension error handling
  */
 
+import { ExtensionLoadResult } from '../api/types.gen';
+import { toastService, ExtensionLoadingStatus } from '../toasts';
+
 export const MAX_ERROR_MESSAGE_LENGTH = 70;
 
 /**
@@ -28,3 +31,43 @@ export function formatExtensionErrorMessage(
 ): string {
   return errorMsg.length < MAX_ERROR_MESSAGE_LENGTH ? errorMsg : fallback;
 }
+
+/**
+ * Shows toast notifications for extension load results.
+ * Uses grouped toast for multiple extensions, individual error toast for single failed extension.
+ * @param results - Array of extension load results from the backend
+ */
+export function showExtensionLoadResults(results: ExtensionLoadResult[] | null | undefined): void {
+  if (!results || results.length === 0) {
+    return;
+  }
+
+  const failedExtensions = results.filter((r) => !r.success);
+
+  if (results.length === 1 && failedExtensions.length === 1) {
+    const failed = failedExtensions[0];
+    const errorMsg = failed.error || 'Unknown error';
+    const recoverHints = createExtensionRecoverHints(errorMsg);
+    const displayMsg = formatExtensionErrorMessage(errorMsg, 'Failed to load extension');
+
+    toastService.error({
+      title: failed.name,
+      msg: displayMsg,
+      traceback: errorMsg,
+      recoverHints,
+    });
+    return;
+  }
+
+  const extensionStatuses: ExtensionLoadingStatus[] = results.map((r) => {
+    const errorMsg = r.error || 'Unknown error';
+    return {
+      name: r.name,
+      status: r.success ? 'success' : 'error',
+      error: r.success ? undefined : errorMsg,
+      recoverHints: r.success ? undefined : createExtensionRecoverHints(errorMsg),
+    };
+  });
+
+  toastService.extensionLoading(extensionStatuses, results.length, true);
+}