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/app_es.arb

@@ -672,6 +672,10 @@
   "stationCount": "{count, plural, =1{1 emisora} other{{count} emisoras}}",
   "alarmIconLabel": "Alarma musical",
   "vacationIconLabel": "Modo vacaciones",
+  "alarmAdvancedSectionTitle": "Avanzado",
+  "alarmInlineHourLabel": "Hora",
+  "alarmInlineMinuteLabel": "Minuto",
+  "alarmVolumeRisingStatus": "Subiendo volumen",
   "streamUrlHint": "https://stream.example.com:8000/radio",
   "@stationCount": {
     "placeholders": {