showPluriSleepTimerSheet already had a working countdown branch
(ServicioTimer.tiempoRestanteStream), but every preset and the custom
duration flow popped the sheet immediately after starting the timer --
so the countdown never rendered in the primary flow, only if the user
happened to reopen the sheet afterwards.
Stop popping the sheet on start; the existing Consumer<EstadoRadio>
already reacts to iniciarTimerDuracion's notifyListeners and swaps to
the countdown view live. Also make the sheet scroll-controlled: at a
realistic phone width the countdown's title + description + headline-
sized remaining-time text overflowed the default half-screen cap that
never mattered while the sheet always closed before that view could
render.
The prototype (t4) draws no global app bar anywhere: every root paints
a plain ~56px title row inside its own content instead (Alarmas line
325, Ajustes line 511, Explorar line 641). app.dart wrapped every tab
in PluriWaveScaffold(appBar: AppBar(title: Text(appTitle), ...)),
adding 56dp of chrome and a "PluriWave" title the prototype never
shows.
Add PluriRootHeader, a shared 56px title-row widget reused by all 5
roots. Extract app.dart's old _mostrarTimerDialog (only reachable from
the removed AppBar action) into a free function,
showPluriSleepTimerSheet, so every root's header can open the same
sheet directly and the sleep-timer feature stays reachable from every
tab with no behaviour change.
S1, Tier 1 visual-fidelity pass (audit id 2521).
FreeTLab