Keep the fake clock across a reload in the offline queue tests

vi.clearAllTimers() resets the fake clock to the real time the fake
timers were installed at, discarding vi.setSystemTime. reload() called
it, so the page opened after a reload read the real date: once the real
time passed the household's plan_draft time (Friday 09:00 New York),
defaultWeek chose next week (2026-10-12), which the tests have no
Supply run for. Restore the clock after clearing the timers.

Task: 880e924e-c248-472f-8e92-1baec5b4cc9f

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/shopping/offlineQueue.test.tsx

@@ -201,10 +201,15 @@ async function openPage() {
 }
 
 // reload ends the page open and its timers, as a reload does: a toggle it
-// was waiting to try again is never tried, by it, again.
+// was waiting to try again is never tried, by it, again. The clock reads on
+// as it did: clearAllTimers also puts it back to the real time the fake
+// timers were installed at, which would open the new page on whatever week
+// the real date falls in.
 function reload(page: { unmount: () => void }) {
   page.unmount()
+  const now = Date.now()
   vi.clearAllTimers()
+  vi.setSystemTime(now)
 }
 
 async function advance(ms: number) {