fix(bienvenida,grabaciones): headline size, CTA radius, storage caption

Screen 14 / audit 14.3+14.7: welcome headline now 34px/ls-1.2 (was
headlineMedium's 28/ls-1.0), CTA restyled to a radius-18 rounded
rectangle instead of Material 3's default StadiumBorder (t4:696,715).

Screen 12 / audit 12.2+12.3: the recordings storage card now shows the
bold "X of Y used" headline ABOVE a 6px/radius-3 bar, followed by a
real folder-path + purge-policy caption below it -- was the bar first
with the "used" string as its only (small, generic) caption (t4:613).
New ARB key recordingsLibraryStorageFolderCaption, translated to all
13 locales.

Item 12.5 (folder/max-size settings living behind the header action
instead of inline on this screen) is a deliberate structural split
from WU15b; the audit itself scopes it out of this pass.

lib/l10n/app_es.arb

@@ -233,6 +233,7 @@
       }
     }
   },
+  "recordingsLibraryStorageFolderCaption": "Music/PluriWave · se borran las más antiguas al llegar al límite",
   "recordingsLibraryEmptyTitle": "Todavía no hay grabaciones",
   "recordingsLibraryEmptySubtitle": "Las grabaciones que guardes van a aparecer acá.",
   "recordingActionRename": "Renombrar",
@@ -315,13 +316,17 @@
   "searchCountryFilterLabel": "País",
   "searchLanguageFilterLabel": "Idioma",
   "searchMinQualityFilterLabel": "Calidad mínima",
+  "searchLoadingStationsLabel": "BUSCANDO EMISORAS…",
   "searchEmptyTitle": "Buscá una emisora",
   "searchNoResultsTitle": "Sin resultados",
+  "searchNoResultsForQueryTitle": "Sin resultados para «{query}»",
+  "@searchNoResultsForQueryTitle": {"placeholders": {"query": {}}},
   "searchEmptySubtitle": "Usá la barra superior o los chips para descubrir señales de todo el mundo.",
   "searchNoResultsSubtitle": "Probá quitar filtros o escribir otro nombre para encontrar una señal activa.",
   "searchResultsCount": "{count, plural, =1{1 resultado} other{{count} resultados}}",
   "searchClearFiltersAction": "{count, plural, =1{Quitar el filtro} other{Quitar los {count} filtros}}",
   "countriesScreenTitle": "Países",
+  "countriesSearchHint": "País o código...",
   "countriesYourLanguagesTitle": "Tus idiomas",
   "countriesAllTitle": "Todos los países",
   "radioCountriesError": "No pudimos cargar los países.",
@@ -509,6 +514,7 @@
       }
     }
   },
+  "alarmSnoozeUsualLabel": "habitual",
   "saveFavoritesAlarmHint": "Guardá emisoras en Favoritos para usarlas como alarma musical.",
   "useCurrentStationAction": "Usar emisora actual",
   "playDuringVacations": "Sonar durante vacaciones",
@@ -654,6 +660,7 @@
   "@alarmScheduleOnce": {"placeholders": {"date": {}}},
   "alarmScheduleWeekdays": "Días: {days}",
   "@alarmScheduleWeekdays": {"placeholders": {"days": {}}},
+  "alarmRepeatSectionLabel": "REPETIR",
   "androidReliabilityTitle": "Revisar fiabilidad Android",
   "closeAction": "Cerrar",
   "customOption": "Personalizada",