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/decision-engine.spec.ts

@@ -355,16 +355,23 @@ test.describe("decision engine", () => {
 
       // Toggle flare on (if not already)
       if (!flareWasChecked) {
-        await flareCheckbox.click();
-        await page.waitForTimeout(500);
+        // Wait for both API calls when clicking the checkbox
+        await Promise.all([
+          page.waitForResponse("**/api/overrides"),
+          page.waitForResponse("**/api/today"),
+          flareCheckbox.click(),
+        ]);
 
-        // Should now be REST
+        // Should now be REST (flare mode forces rest)
         const restDecision = await decisionCard.textContent();
         expect(restDecision).toContain("REST");
 
-        // Toggle flare off
-        await flareCheckbox.click();
-        await page.waitForTimeout(500);
+        // Toggle flare off and wait for API calls
+        await Promise.all([
+          page.waitForResponse("**/api/overrides"),
+          page.waitForResponse("**/api/today"),
+          flareCheckbox.click(),
+        ]);
 
         // Should return to original (or close to it)
         const restoredDecision = await decisionCard.textContent();