[Links] Fix link settings not persisting (#211041)

Closes https://github.com/elastic/kibana/issues/211022

## Summary

This PR fixes a bug with persisting Link options where, because we
weren't providing the "initial" state to the options editor, it was
always starting with the default state - therefore, editing something
**other** than the options would reset the link options back to the
default.

I tested this in `8.14` and the bug was present there, too - based on
[the file history / git
blame](https://github.com/elastic/kibana/blame/main/src/platform/plugins/private/links/public/components/editor/link_editor.tsx#L60),
this bug has been around from the very beginning 🙈

**Before:**


https://github.com/user-attachments/assets/360af02e-ae0f-470c-91a3-a52fc9b3d8c6


**After:**


https://github.com/user-attachments/assets/d1e93bfa-566a-4506-99e3-47f92c922d49



### Checklist

- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- [x] The PR description includes the appropriate Release Notes section,
and the correct `release_note:*` label is applied per the
[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

src/platform/plugins/private/links/public/components/editor/link_editor.test.tsx

@@ -0,0 +1,105 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the "Elastic License
+ * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
+ * Public License v 1"; you may not use this file except in compliance with, at
+ * your election, the "Elastic License 2.0", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+import { render, screen, waitFor } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import React from 'react';
+import { LinkEditor } from './link_editor';
+
+jest.mock('./link_destination', () => {
+  // mock this component to prevent handleDestinationPicked from being called on mount
+  return { LinkDestination: () => <>LinkDestinationMock</> };
+});
+
+describe('LinksEditor', () => {
+  const nonDefaultOptions = {
+    openInNewTab: true,
+    useCurrentDateRange: false,
+    useCurrentFilters: false,
+  };
+
+  const defaultProps = {
+    link: {
+      id: 'foo',
+      type: 'dashboardLink' as const,
+      destination: '123',
+      title: 'dashboard 01',
+    },
+    parentDashboardId: 'test',
+    onSave: jest.fn(),
+    onClose: jest.fn(),
+  };
+
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+
+  const getOptionAriaChecked = (option: string): string | null => {
+    return screen
+      .getByTestId(`dashboardDrillDownOptions--${option}--checkbox`)
+      .getAttribute('aria-checked');
+  };
+
+  describe('dashboard link options', () => {
+    test('starts with default when options not provided', async () => {
+      render(<LinkEditor {...defaultProps} />);
+      await waitFor(() => {
+        expect(screen.queryByTestId('dashboardDrillDownOptions')).not.toBeNull(); // wait for lazy load
+      });
+
+      expect(getOptionAriaChecked('useCurrentFilters')).toBe('true');
+      expect(getOptionAriaChecked('useCurrentDateRange')).toBe('true');
+      expect(getOptionAriaChecked('openInNewTab')).toBe('false');
+    });
+
+    test('properly overrides default values when provided', async () => {
+      render(
+        <LinkEditor
+          {...defaultProps}
+          link={{
+            ...defaultProps.link,
+            options: nonDefaultOptions,
+          }}
+        />
+      );
+      await waitFor(() => {
+        expect(screen.queryByTestId('dashboardDrillDownOptions')).not.toBeNull(); // wait for lazy load
+      });
+
+      expect(getOptionAriaChecked('useCurrentFilters')).toBe('false');
+      expect(getOptionAriaChecked('useCurrentDateRange')).toBe('false');
+      expect(getOptionAriaChecked('openInNewTab')).toBe('true');
+    });
+
+    test('options are persisted on edit', async () => {
+      render(
+        <LinkEditor
+          {...defaultProps}
+          link={{
+            ...defaultProps.link,
+            options: nonDefaultOptions,
+          }}
+        />
+      );
+      await waitFor(() => {
+        expect(screen.queryByTestId('dashboardDrillDownOptions')).not.toBeNull(); // wait for lazy load
+      });
+
+      await userEvent.click(screen.getByTestId('links--linkEditor--linkLabel--input'));
+      await userEvent.keyboard('test label');
+      await userEvent.click(screen.getByTestId('links--linkEditor--saveBtn'));
+
+      expect(defaultProps.onSave).toBeCalledWith({
+        ...defaultProps.link,
+        label: 'test label',
+        options: nonDefaultOptions,
+      });
+    });
+  });
+});

src/platform/plugins/private/links/public/components/editor/link_editor.tsx

@@ -54,10 +54,10 @@ export const LinkEditor = ({
   const [selectedLinkType, setSelectedLinkType] = useState<LinkType>(
     link?.type ?? DASHBOARD_LINK_TYPE
   );
-  const [defaultLinkLabel, setDefaultLinkLabel] = useState<string | undefined>();
+  const [defaultLinkLabel, setDefaultLinkLabel] = useState<string | undefined>(link?.title);
   const [currentLinkLabel, setCurrentLinkLabel] = useState<string>(link?.label ?? '');
-  const [linkDescription, setLinkDescription] = useState<string | undefined>();
-  const [linkOptions, setLinkOptions] = useState<LinkOptions | undefined>();
+  const [linkDescription, setLinkDescription] = useState<string | undefined>(link?.description);
+  const [linkOptions, setLinkOptions] = useState<LinkOptions | undefined>(link?.options);
   const [linkDestination, setLinkDestination] = useState<string | undefined>(link?.destination);
 
   const linkTypes: EuiRadioGroupOption[] = useMemo(() => {

src/platform/plugins/shared/presentation_util/public/components/dashboard_drilldown_options/dashboard_drilldown_options.tsx

@@ -24,7 +24,7 @@ export const DashboardDrilldownOptionsComponent = ({
 }: DashboardDrilldownOptionsProps) => {
   return (
     <>
-      <EuiFormRow>
+      <EuiFormRow data-test-subj="dashboardDrillDownOptions">
         <div>
           <EuiSwitch
             compressed