fix(e2e): use specific locator for customer portal test

getByText('Paws & Reflect') matched 3 elements causing strict mode
violation. Scope to navigation role for unique match.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/e2e/tests/navigation.spec.ts

@@ -42,7 +42,7 @@ test.beforeEach(async ({ page }) => {
 
 test("customer portal loads at root", async ({ page }) => {
   await page.goto("/");
-  await expect(page.getByText("Paws & Reflect")).toBeVisible();
+  await expect(page.getByRole("navigation").getByText("Paws & Reflect")).toBeVisible();
   await expect(page.locator("nav")).toBeVisible();
 });