Fix E2E test reliability issues and stale data bugs

- Fix race conditions: Set workers: 1 since all tests share test user state
- Fix stale data: GET /api/user and /api/cycle/current now fetch fresh data
  from database instead of returning stale PocketBase auth store cache
- Fix timing: Replace waitForTimeout with retry-based Playwright assertions
- Fix mobile test: Use exact heading match to avoid strict mode violation
- Add test user setup: Include notificationTime and update rule for users

All 1014 unit tests and 190 E2E tests pass.

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

e2e/mobile.spec.ts

@@ -140,15 +140,18 @@ test.describe("mobile viewport", () => {
       const viewportSize = page.viewportSize();
       expect(viewportSize?.width).toBe(375);
 
-      // Calendar heading should be visible
-      const heading = page.getByRole("heading", { name: /calendar/i });
-      await expect(heading).toBeVisible();
+      // Calendar page title heading should be visible (exact match to avoid "Calendar Subscription")
+      const heading = page.getByRole("heading", {
+        name: "Calendar",
+        exact: true,
+      });
+      await expect(heading).toBeVisible({ timeout: 10000 });
 
       // Calendar grid should be visible
       const calendarGrid = page
         .getByRole("grid")
         .or(page.locator('[data-testid="month-view"]'));
-      await expect(calendarGrid).toBeVisible();
+      await expect(calendarGrid).toBeVisible({ timeout: 5000 });
 
       // Month navigation should be visible
       const monthYear = page.getByText(