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.dart

@@ -2564,6 +2564,30 @@ abstract class AppLocalizations {
   /// **'Modo vacaciones'**
   String get vacationIconLabel;
 
+  /// No description provided for @alarmAdvancedSectionTitle.
+  ///
+  /// In es, this message translates to:
+  /// **'Avanzado'**
+  String get alarmAdvancedSectionTitle;
+
+  /// No description provided for @alarmInlineHourLabel.
+  ///
+  /// In es, this message translates to:
+  /// **'Hora'**
+  String get alarmInlineHourLabel;
+
+  /// No description provided for @alarmInlineMinuteLabel.
+  ///
+  /// In es, this message translates to:
+  /// **'Minuto'**
+  String get alarmInlineMinuteLabel;
+
+  /// No description provided for @alarmVolumeRisingStatus.
+  ///
+  /// In es, this message translates to:
+  /// **'Subiendo volumen'**
+  String get alarmVolumeRisingStatus;
+
   /// No description provided for @streamUrlHint.
   ///
   /// In es, this message translates to: