feat: Add localization for hourly rate and enhance geofence notifications

- Added localization for hourly rate in English and Spanish.
- Updated background geofence service to use localized notification titles and bodies.
- Enhanced ClockInBloc to compute time window flags for check-in/check-out availability.
- Updated ClockInState and ClockInEvent to include check-in/check-out availability flags and messages.
- Refactored ClockInActionSection to display availability messages based on computed flags.
- Ensured compliance with design system for user-facing strings and notification messages.

apps/mobile/packages/core_localization/lib/src/l10n/en.i18n.json

@@ -862,6 +862,7 @@
       "great_work": "Great work today",
       "no_shifts_today": "No confirmed shifts for today",
       "accept_shift_cta": "Accept a shift to clock in",
+      "per_hr": "\\$$amount/hr",
       "soon": "soon",
       "checked_in_at_label": "Checked in at",
       "not_in_range": "You must be within $distance m to clock in.",

apps/mobile/packages/core_localization/lib/src/l10n/es.i18n.json

@@ -857,6 +857,7 @@
       "great_work": "Buen trabajo hoy",
       "no_shifts_today": "No hay turnos confirmados para hoy",
       "accept_shift_cta": "Acepte un turno para registrar su entrada",
+      "per_hr": "\\$$amount/hr",
       "soon": "pronto",
       "checked_in_at_label": "Entrada registrada a las",
       "nfc_dialog": {