Apply Progress: alarm-clock-module

2026-05-22 batch 2

Added explicit one-shot alarm date support (fechaUnica) to the alarm model, JSON persistence and recurrence calculator.
Replaced demo alarm creation with a real editor sheet: name, date, time, schedule type, weekdays, snooze 3/5/10, volume, internal fallback sound, vacation behavior and current-station capture.
Added automatic alarm schedule refresh in EstadoAlarmas, including persistence recalculation and Android resync.
Changed the alarm screen from a prominent Android reliability panel to a compact diagnostic action, and added next-execution/skip feedback.
Generated a premium alarm icon sheet with image_gen, copied the source sheet to assets/generated/, sliced transparent app assets to assets/icons/alarmas/, and registered the asset directory in pubspec.yaml.

Added vacation ranges UI with create/delete flow and alarm cards that explain when vacation pauses affect the next execution.
Added bundled internal fallback WAV sounds under assets/audio/ and registered them in pubspec.yaml.
Added PantallaAlarmaSonando with stop, snooze 3/5/10, radio attempt, fallback timeout and safe internal looping sound.
Added native-to-Flutter alarm intent handling so Android alarm firing opens the ringing screen.
Added silent native pre-notification 30 minutes before alarms, with action to omit the next execution through the app bridge.
Added Android initial/new-intent delivery over the alarm MethodChannel.
Verified with flutter analyze --no-fatal-infos: no issues.

flutter analyze --no-fatal-infos passes.
No build was executed, per project instruction.
dart format still times out in this local environment; source remains analyzer-clean.

Added vacation range management in alarms UI: list current ranges, create range with start/end dates and delete existing ranges.
Added EstadoAlarmas.crearRangoVacaciones and EstadoAlarmas.eliminarRangoVacaciones to support UI actions directly.
Added ServicioAlarmas.crearRangoVacaciones and normalization/sorting in guardarVacaciones (swaps start/end if needed and stores ordered ranges).
Added alarm-card messaging for alarms with sonarEnVacaciones = false, explicitly showing when vacations are currently pausing execution and when it will resume.
Tried flutter analyze --no-fatal-infos twice in this environment; both attempts timed out (120s and 300s), so this batch could not be analyzer-verified locally.