Restore notifications data on Omarchy 4.0.3 scoped hosts

[Macho0x]

Omarchy 4.0.3 compatibility: the first-party notifications service is unreachable

Omarchy 4.0.3 capability-scopes plugin shell access (shell/services/PluginShellApi.qml). For a bar-widget the facade's firstPartyServiceFor() answers null (the service goes only to its owners), so notificationService was null and — silently — the live count never moved, DND was reported unsupported, the history list stayed empty, and the Clear all button returned early.

The host still runs the service itself; only the object reference is gated. Its state is reachable two ways, and both are stable first-party host constants (notifications/Service.qml):

• history — one JSON file per moved notification under ~/.local/state/omarchy/notifications/history; historyDir now falls back to that path when the service object is unavailable, so the existing bash/awk history reader and its 500 ms poll work unchanged
• DND — the service persists {dnd} to ~/.local/state/omarchy/notifications.json on every change; a watched FileView on that file now feeds dndOn (live, no polling), and toggleDnd falls back to the host's own notifications IPC target (omarchy-shell -q notifications toggleDnd) which is not capability-gated

clearAll no longer returns early on a scoped host: it falls back to the host IPC (dismissAll + clear) and clears local rows, so the button works again.

Deliberately left as graceful degradation, with a code comment:

• the live popup model cannot be reached without the service object, so the merged list shows on-disk history entries; live toasts keep arriving through the shell's own daemon and land in history when dismissed
• dismissPopup/removeHistoryEntry remain guarded and skipped (as they already were when the method was absent)

The service-object path is kept first and unchanged for hosts that still hand it over (pre-4.0.3 shells), so nothing regresses there. Version bumped to 1.3.1.

Testing

• Reinstall/re-enable on Omarchy 4.0.3-1, omarchy restart shell
• Open the popup: history entries list and refresh while open
• Trigger a notification (dismiss it) → it appears in the list via history
• Right-click toggles DND: the icon flips, and cat ~/.local/state/omarchy/notifications.json shows "dnd": true; toggling from Omarchy's own indicators updates the icon live through the file watcher
• Clear all empties the list and the on-disk history