feat(setup): noon-daily default + force-refresh hint + inline remove confirm

Three coordinated UX changes touching defaults and the settings sheet.

1. Server defaults: DeviceService::linkToUser now sets timezone =
   user.timezone and wakeTimes = [12*60] (noon-daily) when creating a
   new Device row OR transferring ownership on takeover. Replaces the
   prior "1440-min interval anchored to last-seen-time" default that
   could land a recipient's first photo at 3 am.

2. PWA propagation note: now mentions "briefly disconnect and reconnect
   the frame's power" as the immediate-refresh gesture. Pairs with the
   existing X-Boot-Reason: cold force-resync — the firmware already
   honors a power-cycle as a deliberate refresh request, but users had
   no way to discover that.

3. Remove-this-frame: replaced the native window.confirm() with an
   in-sheet confirmation panel showing the explanatory text. Inline
   keeps the gesture inside the existing sheet flow and gives the
   destructive button a fixed location, instead of a floating native
   dialog that varies per browser. The confirm body explicitly says
   "this can't be undone" to match the irreversibility.

Tests:
  - DeviceServiceTest: new-device default, takeover-resets-with-default,
    UTC fallback when user has empty timezone.
  - SetupControllerTest: claim-takes-over-defaults updated to assert
    [12*60] wakeTimes.
  - HomeView.test: 4 cases covering open-confirm, yes-confirm, cancel,
    propagation-note text.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

public/build/index.html

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