feat: show a saving spinner and allow cancelling credential edits

Drive the tool credential Save button from the real mutation state so it
shows a spinner while the request is in flight, and add a Cancel button
when re-editing already-saved credentials so the edit can be dismissed.

client/src/components/Plugins/Store/PluginAuthForm.tsx

@@ -1,5 +1,13 @@
 import { useForm, useWatch } from 'react-hook-form';
-import { HoverCard, HoverCardTrigger, SecretInput, Input, Label, Button } from '@librechat/client';
+import {
+  Input,
+  Label,
+  Button,
+  Spinner,
+  HoverCard,
+  SecretInput,
+  HoverCardTrigger,
+} from '@librechat/client';
 import type { TPlugin, TPluginAuthConfig, TPluginAction } from 'librechat-data-provider';
 import type { RegisterOptions } from 'react-hook-form';
 import PluginTooltip from './PluginTooltip';
@@ -70,9 +78,19 @@ type TPluginAuthFormProps = {
   plugin: TPlugin | undefined;
   onSubmit: (installActionData: TPluginAction) => void;
   isEntityTool?: boolean;
+  /** External in-flight state (e.g. a mutation) so the button reflects the real save. */
+  isSaving?: boolean;
+  /** When provided, renders a Cancel button (used when re-editing saved credentials). */
+  onCancel?: () => void;
 };
 
-function PluginAuthForm({ plugin, onSubmit, isEntityTool }: TPluginAuthFormProps) {
+function PluginAuthForm({
+  plugin,
+  onSubmit,
+  isEntityTool,
+  isSaving,
+  onCancel,
+}: TPluginAuthFormProps) {
   const {
     register,
     control,
@@ -84,6 +102,7 @@ function PluginAuthForm({ plugin, onSubmit, isEntityTool }: TPluginAuthFormProps
   const watchedValues = useWatch({ control });
   const authConfig = plugin?.authConfig ?? [];
   const allFieldsOptional = authConfig.length > 0 && authConfig.every((c) => c.optional === true);
+  const saving = isSubmitting || isSaving === true;
 
   const submit = handleSubmit((auth) =>
     onSubmit({
@@ -178,14 +197,20 @@ function PluginAuthForm({ plugin, onSubmit, isEntityTool }: TPluginAuthFormProps
           );
         })}
       </div>
-      <div className="mt-4 flex justify-end">
+      <div className="mt-4 flex justify-end gap-2">
+        {onCancel && (
+          <Button type="button" variant="outline" disabled={saving} onClick={onCancel}>
+            {localize('com_ui_cancel')}
+          </Button>
+        )}
         <Button
           type="button"
           variant="submit"
-          disabled={allFieldsOptional ? isSubmitting : !isDirty || !isValid || isSubmitting}
+          disabled={allFieldsOptional ? saving : !isDirty || !isValid || saving}
           onClick={submit}
         >
-          {isSubmitting ? localize('com_ui_saving') : localize('com_ui_save')}
+          {saving && <Spinner className="size-4" aria-hidden="true" />}
+          {saving ? localize('com_ui_saving') : localize('com_ui_save')}
         </Button>
       </div>
     </form>

client/src/components/Plugins/Store/__tests__/PluginAuthForm.spec.tsx

@@ -1,5 +1,5 @@
-import { render, screen } from 'test/layout-test-utils';
 import userEvent from '@testing-library/user-event';
+import { render, screen } from 'test/layout-test-utils';
 import PluginAuthForm from '../PluginAuthForm';
 
 describe('PluginAuthForm', () => {
@@ -76,4 +76,29 @@ describe('PluginAuthForm', () => {
       },
     });
   });
+
+  it('reflects an external saving state as a disabled, in-progress submit button', () => {
+    //@ts-ignore - dont need all props of plugin
+    render(<PluginAuthForm plugin={plugin} onSubmit={onSubmit} isSaving />);
+
+    const button = screen.getByRole('button', { name: 'Saving...' });
+    expect(button).toBeDisabled();
+    expect(screen.queryByRole('button', { name: 'Save' })).not.toBeInTheDocument();
+  });
+
+  it('renders a Cancel button when onCancel is provided and invokes it on click', async () => {
+    const onCancel = jest.fn();
+    //@ts-ignore - dont need all props of plugin
+    render(<PluginAuthForm plugin={plugin} onSubmit={onSubmit} onCancel={onCancel} />);
+
+    await userEvent.click(screen.getByRole('button', { name: 'Cancel' }));
+    expect(onCancel).toHaveBeenCalledTimes(1);
+    expect(onSubmit).not.toHaveBeenCalled();
+  });
+
+  it('does not render a Cancel button by default', () => {
+    //@ts-ignore - dont need all props of plugin
+    render(<PluginAuthForm plugin={plugin} onSubmit={onSubmit} />);
+    expect(screen.queryByRole('button', { name: 'Cancel' })).not.toBeInTheDocument();
+  });
 });

client/src/components/SidePanel/Agents/Tools/ItemDialog/sections/ToolSection.tsx

@@ -83,7 +83,15 @@ export default function ToolSection({ item }: Props) {
           </button>
         </div>
       )}
-      {showForm && <PluginAuthForm plugin={item.plugin} isEntityTool onSubmit={handleSubmit} />}
+      {showForm && (
+        <PluginAuthForm
+          plugin={item.plugin}
+          isEntityTool
+          isSaving={updateUserPlugins.isLoading}
+          onCancel={editing ? () => setEditing(false) : undefined}
+          onSubmit={handleSubmit}
+        />
+      )}
     </div>
   );
 }