fix(07-04): make calendar populated-state test non-vacuous (BL-01) + deterministic seed window (BL-02)

Deep review found the calendar 'populated state' assertions were vacuous:
- getByText('Nothing here').toHaveCount(0) targeted CalendarShell's EmptyState,
  which CalendarShell NEVER renders (success branch always mounts ScheduleXCalendar;
  EmptyState.tsx is dead code, imported by nothing). The check was permanently green
  regardless of the seed — a regression dropping all events would have shipped green.
- .sx-react-calendar-wrapper renders on any successful auth, with or without events,
  so it never proved the seed reached the UI.

Replaced the dead-EmptyState check with a real DB→UI proof: assert the seeded event
title 'Seeded Test Event' is rendered in the grid. Verified non-vacuous — passes with
the seed on both profiles; with /api/events mocked to [] the title is absent (would fail).

BL-02: the seed anchored the event at now+24h. Both phone profiles render the
month-agenda view of the CURRENT month, so on a month's last day 'tomorrow' falls into
the next month and vanishes from the grid, making the new visibility assertion date-fragile.
Re-anchored to noon-today (UTC) — always today's local date, always in the current-month view.

Verified: full 58-test suite passes both profiles; typecheck clean.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/pwa/e2e/global-setup.ts

@@ -92,9 +92,17 @@ export default async function globalSetup(): Promise<void> {
     )
 
     // Seed one timed (not all-day) calendar event on shared calendar id=10.
-    // Uses a future dtstart_utc so the event is visible in the UI's default "upcoming" view.
+    // Anchor to NOON TODAY (UTC) — deliberately NOT "tomorrow" (deep-review BL-02):
+    // both device profiles are phone-width and render the month-agenda view of the
+    // CURRENT month. On the last day of a month "tomorrow" rolls into the next month
+    // and disappears from the rendered grid, making any "seeded event is visible"
+    // assertion date-fragile. Noon-today lands on today's local calendar date in every
+    // project timezone and is always inside the current-month view.
     const uid = 'e2e-seed-event-001'
-    const futureStart = new Date(Date.now() + 24 * 60 * 60 * 1000) // tomorrow UTC
+    const _now = new Date()
+    const futureStart = new Date(
+      Date.UTC(_now.getUTCFullYear(), _now.getUTCMonth(), _now.getUTCDate(), 12, 0, 0),
+    )
     // MariaDB TIMESTAMP requires 'YYYY-MM-DD HH:MM:SS' format, not ISO 8601 with 'T'.
     const futureStartUtc = futureStart
       .toISOString()