Weather info popup, larger System menu buttons, group Flight toggles

Tapping the weather icon in the header now shows a small info popup
explaining that the shown weather always follows the currently active
location (including an active location preset).

The System menu's buttons now fill the available screen height
instead of leaving unused space below, computed from a dedicated
systemRowRect() helper. "Info" (About) is pinned as the second-to-last
entry, directly above Back, so its position stays stable regardless of
how many other entries come before it.

In the Flight options menu, all plain ON/OFF toggles (LED heartbeat,
emergency alert, proximity LED, watchlist alert, hide ground vehicles)
are now grouped together at the end of the list, right above Back,
instead of being interleaved with the screen/list entries above them.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/i18n_es.h

@@ -200,6 +200,9 @@ static const char* const I18N_ES[] = {
     "Registro / WebUI",
     "Esta página web permite ver, descargar y eliminar individualmente el registro de vuelo directamente desde un navegador. Conectado a la misma red WiFi, simplemente abre un navegador y ve a:",
     "Sin conexión WiFi - la página solo es accesible mientras haya una conexión de red.",
+
+    "Clima",
+    "El icono del clima muestra el clima actual de tu ubicación activa. Si hay una ubicación guardada seleccionada, se muestra el clima de esa ubicación en su lugar.",
 };
 
 static_assert(sizeof(I18N_ES) / sizeof(I18N_ES[0]) == (size_t)StringId::COUNT,