feat(alarmas): rewrite alarm editor with inline time widget

Replace the native showTimePicker dialog in the alarm editor sheet with
a giant inline HH:MM editor (drag/tap to adjust, wraps at 23:59-00:00).
Weekday circles now render unconditionally (disabled outside weekly
mode) instead of being gated behind an `if`.

The date field, fallback-station picker, and sound dropdown are not
dropped: per resolution 3 they move into a collapsed "Advanced" section
so the mockup's weekday-circles-only layout does not lose capability.
Volume/fade-in sliders get a cosmetic type-scale restyle only.

size:exception: 993 changed lines (891+/102-) against the 500-650
forecast - lib/ production code alone is 429 lines, within band; new
test files and 13 regenerated l10n/gen files account for the rest, the
same pattern every prior work unit in this branch has hit.

lib/l10n/gen/app_localizations_ar.dart

@@ -1410,6 +1410,18 @@ class AppLocalizationsAr extends AppLocalizations {
   @override
   String get vacationIconLabel => 'وضع الإجازة';
 
+  @override
+  String get alarmAdvancedSectionTitle => 'Avanzado';
+
+  @override
+  String get alarmInlineHourLabel => 'Hora';
+
+  @override
+  String get alarmInlineMinuteLabel => 'Minuto';
+
+  @override
+  String get alarmVolumeRisingStatus => 'Subiendo volumen';
+
   @override
   String get streamUrlHint => 'https://stream.example.com:8000/radio';