Three intertwined fixes so that marking a notification as read from the
trailing menu, swipe-dismiss, and 'Mark all as read' all consistently
update the UI and surface backend failures.
- Guard the mark-read, mark-new, and mark-all calls with try/catch; on
failure show a snackbar with the mapped error and leave the list
untouched.
- Use the State's own `mounted` and `context` after the await instead of
the per-card BuildContext, so the SliverList rebuild reliably runs
even when the originating NotificationCard's element has been swapped
out by the reconciliation. _setRead and _markAllAsRead no longer take
a BuildContext.
- Replace `Dismissible(key: UniqueKey())` with `ValueKey(item.id)` in
the notification card. UniqueKey was regenerated on every build,
forcing the Dismissible/PopupMenuButton subtree to be disposed on any
parent rebuild; the open menu's `mounted` check would then drop
`onSelected` silently.
- Add `ValueKey(device.macAddress)` to the device list rows for the
same reason, anchoring each row's Element (and its PopupMenuButton
State) to its device identity instead of its list position.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
- Convert ArpScannerCard to a self-managing StatefulWidget (owns its own 5s refresh + 1s tick timers), removing the duplicated state management that existed in both HomeScreen and StatusScreen
- Extract NotificationCard to home/notification_card.dart
- Extract DeviceSummaryCard (with its 1-min refresh timer) to widgets/device_summary_card.dart
- HomeScreen drops from 515 to 253 lines; StatusScreen from 82 to 19 lines
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
