diff --git a/apps/pwa/e2e/calendar.spec.ts b/apps/pwa/e2e/calendar.spec.ts
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+++ b/apps/pwa/e2e/calendar.spec.ts
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+/**
+ * calendar.spec.ts — TEST-01 + TEST-02
+ *
+ * Route-specific state assertions for /calendar (UI-SPEC Rules 4/5):
+ *   - Populated state: Schedule-X grid visible, EmptyState absent
+ *   - Error state: 'Couldn't load events' heading + Retry button ≥44px + no overflow
+ *   - Auth-bypass precondition: authed content reached via DEV_AUTH_BYPASS (no OIDC mock)
+ *   - SW-block precondition: navigator.serviceWorker.controller is null (no controlling SW)
+ *
+ * Requires the dev stack running with DEV_AUTH_BYPASS=true (see e2e/README.md).
+ * global-setup seeds 'Seeded Test Event' on calendar_id=10 for user_id=1.
+ *
+ * Runs on both device profiles automatically (playwright.config.ts matrix):
+ *   iphone: iPhone 14 / WebKit / 390×844
+ *   pixel:  Pixel 7 / Chromium / 412×915
+ *
+ * Run:
+ *   pnpm --filter @familysync/pwa test:e2e
+ *   pnpm --filter @familysync/pwa exec playwright test --project=pixel calendar.spec.ts
+ */
+import { test, expect } from '@playwright/test'
+
+// ── TEST-02 preconditions: DEV_AUTH_BYPASS + no SW controller ─────────────────
+
+test.describe('TEST-02 preconditions — auth bypass and SW block', () => {
+  test('DEV_AUTH_BYPASS reached authed PWA without OIDC mock', async ({ page }) => {
+    await page.goto('/calendar')
+
+    // Wait for the authed content to appear — DEV_AUTH_BYPASS should resolve immediately
+    // without Authelia redirect. The BottomTabBar nav landmark is only rendered after auth.
+    const nav = page.getByRole('navigation', { name: 'Main navigation' })
+    await expect(nav).toBeVisible()
+
+    // Confirm we are NOT on an external auth host (Authelia login page would redirect the URL)
+    const url = new URL(page.url())
+    expect(url.hostname, `Expected to remain on localhost or 127.0.0.1, got: ${url.hostname}`).toMatch(
+      /^(localhost|127\.0\.0\.1)$/,
+    )
+  })
+
+  test('no service-worker controller (serviceWorkers: block enforced)', async ({ page }) => {
+    await page.goto('/calendar')
+
+    // serviceWorkers: 'block' in playwright.config.ts prevents SW registration.
+    // navigator.serviceWorker.controller is null when no SW is controlling the page.
+    // Note: navigator.serviceWorker may be undefined in some contexts (e.g. non-https),
+    // but in the dev server context it is defined. Treat undefined as no-controller (safe).
+    const controller = await page.evaluate(() => {
+      if (typeof navigator === 'undefined') return null
+      if (!('serviceWorker' in navigator)) return null
+      return navigator.serviceWorker.controller
+    })
+    expect(controller, 'Service worker controller should be null (serviceWorkers:block enforced)').toBeNull()
+  })
+})
+
+// ── Rule 5: Populated state ───────────────────────────────────────────────────
+
+test.describe('Rule 5 — populated calendar state', () => {
+  test.beforeEach(async ({ page }) => {
+    await page.goto('/calendar')
+    // Wait for auth and Schedule-X to render before asserting
+    await expect(page.getByRole('navigation', { name: 'Main navigation' })).toBeVisible()
+  })
+
+  test('Schedule-X calendar grid is visible after seeding', async ({ page }) => {
+    // The Schedule-X React adapter emits a div.sx-react-calendar-wrapper.
+    // Prefer a stable locator: the class name is documented in apps/pwa/src/styles/index.css.
+    // No semantic role exists for the widget wrapper, so CSS class is the documented fallback.
+    const calendarGrid = page.locator('.sx-react-calendar-wrapper')
+    await expect(calendarGrid).toBeVisible()
+  })
+
+  test('EmptyState "Nothing here" is NOT present when events are seeded', async ({ page }) => {
+    // CalendarShell renders EmptyState when the events query succeeds with zero occurrences.
+    // With the seeded event, EmptyState must not appear. Use toHaveCount(0) for strict absence.
+    await expect(page.getByText('Nothing here')).toHaveCount(0)
+  })
+
+  test('no horizontal overflow on populated /calendar (Rule 2)', async ({ page }) => {
+    const overflow = await page.evaluate(() => ({
+      scrollWidth: document.documentElement.scrollWidth,
+      clientWidth: document.documentElement.clientWidth,
+    }))
+    expect(
+      overflow.scrollWidth,
+      `scrollWidth (${overflow.scrollWidth}) must be ≤ clientWidth (${overflow.clientWidth}) on populated /calendar`,
+    ).toBeLessThanOrEqual(overflow.clientWidth)
+  })
+})
+
+// ── Rule 5: Error state ───────────────────────────────────────────────────────
+
+test.describe('Rule 5 — calendar error state (API mocked to 500)', () => {
+  test('error heading + Retry button visible when /api/events returns 500', async ({ page }) => {
+    // Register route BEFORE page.goto — the intercept must be in place before navigation
+    // so the very first events request is caught (Pattern 5).
+    await page.route('/api/events*', (route) =>
+      route.fulfill({ status: 500, body: JSON.stringify({ error: 'simulated' }) }),
+    )
+
+    await page.goto('/calendar')
+
+    // Wait for auth (DEV_AUTH_BYPASS)
+    await expect(page.getByRole('navigation', { name: 'Main navigation' })).toBeVisible()
+
+    // eventsQuery has retry:2 so Playwright may need to wait for all retries before
+    // the error branch renders. Use default Playwright timeout.
+    const errorHeading = page.getByRole('heading', { name: "Couldn't load events" })
+    await expect(errorHeading).toBeVisible()
+
+    const retryBtn = page.getByRole('button', { name: 'Retry' })
+    await expect(retryBtn).toBeVisible()
+
+    // Unroute so the mock does not leak to subsequent tests (T-07-11)
+    await page.unroute('/api/events*')
+  })
+
+  test('Retry button meets 44px touch-target minimum in error state (Rule 1)', async ({
+    page,
+  }) => {
+    await page.route('/api/events*', (route) =>
+      route.fulfill({ status: 500, body: JSON.stringify({ error: 'simulated' }) }),
+    )
+
+    await page.goto('/calendar')
+    await expect(page.getByRole('navigation', { name: 'Main navigation' })).toBeVisible()
+
+    const retryBtn = page.getByRole('button', { name: 'Retry' })
+    await expect(retryBtn).toBeVisible()
+
+    const box = await retryBtn.boundingBox()
+    expect(box, 'Retry button bounding box must not be null').not.toBeNull()
+    expect(box!.height, 'Retry button height must be ≥ 44px (Rule 1)').toBeGreaterThanOrEqual(44)
+
+    await page.unroute('/api/events*')
+  })
+
+  test('no horizontal overflow in error state (Rule 2)', async ({ page }) => {
+    await page.route('/api/events*', (route) =>
+      route.fulfill({ status: 500, body: JSON.stringify({ error: 'simulated' }) }),
+    )
+
+    await page.goto('/calendar')
+    await expect(page.getByRole('navigation', { name: 'Main navigation' })).toBeVisible()
+
+    // Wait for error heading to confirm the error branch has rendered
+    await expect(page.getByRole('heading', { name: "Couldn't load events" })).toBeVisible()
+
+    const overflow = await page.evaluate(() => ({
+      scrollWidth: document.documentElement.scrollWidth,
+      clientWidth: document.documentElement.clientWidth,
+    }))
+    expect(
+      overflow.scrollWidth,
+      `scrollWidth (${overflow.scrollWidth}) must be ≤ clientWidth (${overflow.clientWidth}) in error state`,
+    ).toBeLessThanOrEqual(overflow.clientWidth)
+
+    await page.unroute('/api/events*')
+  })
+})