fix(e2e): expand storage classes sidebar nav and relax plugin settings locator

The 'Storage Classes' link is nested under the Rook sidebar button, not
at the top level. Expand the Rook section before asserting visibility.
Also uses /rook/i case-insensitive regex and waits for the plugins list
to render before searching.

e2e/rook.spec.ts

@@ -42,8 +42,12 @@ test.describe('Rook plugin smoke tests', () => {
 
   test('navigation to storage classes view works', async ({ page }) => {
     await page.goto('/c/main/rook-ceph');
-
     const sidebar = page.getByRole('navigation', { name: 'Navigation' });
+
+    const rookBtn = sidebar.getByRole('button', { name: /rook/i });
+    await rookBtn.click();
+    await page.waitForLoadState('networkidle');
+
     const storageClassesLink = sidebar.getByRole('link', { name: /storage classes/i });
     await expect(storageClassesLink).toBeVisible({ timeout: 10_000 });
     await storageClassesLink.click();
@@ -56,8 +60,9 @@ test.describe('Rook plugin smoke tests', () => {
   test('plugin settings page shows rook plugin entry', async ({ page }) => {
     await page.goto('/settings/plugins');
     await page.waitForLoadState('networkidle');
+    await page.waitForSelector('[class*="PluginList"], [class*="plugins"], table, list', { timeout: 10_000 }).catch(() => {});
 
-    const pluginEntry = page.locator('text=rook').first();
+    const pluginEntry = page.locator('text=/rook/i').first();
     await expect(pluginEntry).toBeVisible({ timeout: 30_000 });
   });
 });