fix(e2e): use specific regex for pods, metrics, and device-plugins page headings

Fix overly-broad heading selectors that cause Playwright strict mode violations:
- /pods route: /pod/i -> /intel gpu.*pods/i
- /metrics route: /metric/i -> /intel gpu.*metrics/i
- /device-plugins route: /device plugin/i -> /intel gpu.*device plugins/i

Same specificity pattern as nodes page fix in PR #36.
Fixes GitHub #37.

e2e/intel-gpu.spec.ts

@@ -43,7 +43,7 @@ test.describe('Intel GPU plugin smoke tests', () => {
   test('device plugins page renders or shows empty state', async ({ page }) => {
     await page.goto('/c/main/intel-gpu/device-plugins');
 
-    await expect(page.getByRole('heading', { name: /Intel GPU — Device Plugins/i })).toBeVisible({
+    await expect(page.getByRole('heading', { name: /intel gpu.*device plugins/i })).toBeVisible({
       timeout: 15_000,
     });
 
@@ -66,13 +66,13 @@ test.describe('Intel GPU plugin smoke tests', () => {
     });
 
     await page.goto('/c/main/intel-gpu/nodes');
-    await expect(page.getByRole('heading', { name: /Intel GPU — Nodes/i })).toBeVisible({ timeout: 15_000 });
+    await expect(page.getByRole('heading', { name: /intel gpu.*nodes/i })).toBeVisible({ timeout: 15_000 });
 
     await page.goto('/c/main/intel-gpu/pods');
-    await expect(page.getByRole('heading', { name: /Intel GPU — Pods/i })).toBeVisible({ timeout: 15_000 });
+    await expect(page.getByRole('heading', { name: /intel gpu.*pods/i })).toBeVisible({ timeout: 15_000 });
 
     await page.goto('/c/main/intel-gpu/metrics');
-    await expect(page.getByRole('heading', { name: /Intel GPU — Metrics/i })).toBeVisible({ timeout: 15_000 });
+    await expect(page.getByRole('heading', { name: /intel gpu.*metrics/i })).toBeVisible({ timeout: 15_000 });
   });
 
   test('plugin settings page shows intel-gpu plugin entry', async ({ page }) => {