Enable 5 previously skipped e2e tests

- Fix OIDC tests with route interception for auth-methods API
- Add data-testid to DecisionCard for reliable test selection
- Fix /api/today to fetch fresh user data instead of stale cookie data
- Fix period logging test timing with proper API wait patterns
- Fix decision engine test with waitForResponse instead of timeout
- Simplify mobile viewport test locator

All 206 e2e tests now pass with 0 skipped.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

e2e/period-logging.spec.ts

@@ -192,9 +192,7 @@ test.describe("period logging flow - onboarding user", () => {
     await onboardingPage.getByRole("button", { name: /cancel/i }).click();
   });
 
-  // TODO: This test is flaky - the save succeeds but the dashboard doesn't
-  // always refresh in time. Needs investigation into React state updates.
-  test.skip("logging period from modal updates dashboard cycle info", async ({
+  test("logging period from modal updates dashboard cycle info", async ({
     onboardingPage,
   }) => {
     await onboardingPage.goto("/");
@@ -220,19 +218,20 @@ test.describe("period logging flow - onboarding user", () => {
     const dateInput = onboardingPage.locator('input[type="date"]');
     await dateInput.fill(dateStr);
 
-    // Click Save
+    // Click Save button
     await onboardingPage.getByRole("button", { name: /save/i }).click();
 
-    // Modal should close
-    await expect(modalTitle).not.toBeVisible();
+    // Modal should close after successful save
+    await expect(modalTitle).not.toBeVisible({ timeout: 10000 });
 
-    // Wait for data to refresh after successful save
-    // The dashboard refetches data and should show cycle info
+    // Wait for network activity to settle
     await onboardingPage.waitForLoadState("networkidle");
 
     // Look for cycle day display (e.g., "Day 8 · Follicular" or similar)
-    // This appears after the dashboard refetches data post-save
-    const cycleInfo = onboardingPage.getByText(/day\s+\d+\s+·/i);
+    // The page fetches /api/cycle/period, then /api/today and /api/user
+    // Content only renders when both todayData and userData are available
+    // Use .first() as the pattern may match multiple elements on the page
+    const cycleInfo = onboardingPage.getByText(/day\s+\d+\s+·/i).first();
     await expect(cycleInfo).toBeVisible({ timeout: 15000 });
   });
 });