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_en.arb

@@ -720,6 +720,10 @@
   "stationCount": "{count, plural, =1{1 station} other{{count} stations}}",
   "alarmIconLabel": "Musical alarm",
   "vacationIconLabel": "Vacation mode",
+  "alarmAdvancedSectionTitle": "Advanced",
+  "alarmInlineHourLabel": "Hour",
+  "alarmInlineMinuteLabel": "Minute",
+  "alarmVolumeRisingStatus": "Turning up the volume",
   "streamUrlHint": "https://stream.example.com:8000/radio",
   "advancedEqSectionTitle": "Advanced Equalization Options",
   "advancedEqEnableToggle": "Enable per-device EQ",