Fix address search keyboard hint/punctuation and add setup-complete screen

The address search screen previously gave no hint about the expected
input format and had no punctuation keys at all on either keyboard
page, making addresses like a house number "45/3" impossible to type.
Adds a localized format-hint line under the title, comma/hyphen keys
on the main keyboard, and swaps four rarely-needed accented letters on
the special-character page for "/", ".", "'", "-". The header and
input field position are now measured dynamically (getCursorY())
instead of assuming a fixed pixel offset, so longer translations of
the hint text don't overlap the keyboard.

Adds a new FirstRunCompleteScreen shown after the location setup step
on first boot: confirms setup is done, names the SD card folder all
data is stored in, and notes that WiFi will reconnect automatically
from now on, with a large "Flightradar" button leading into the app.

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

src/i18n_es.h

@@ -221,6 +221,12 @@ static const char* const I18N_ES[] = {
     "Omitir",
 
     "Consejo: usa el botón \"Buscar por dirección\" al añadir un preset (\"+\") para obtener al instante coordenadas exactas de tu dirección - mucho más preciso que la geolocalización automática por IP, que puede fallar fácilmente por 20-30 km. Con tu ubicación exacta configurada, el LED de proximidad realmente parpadea al ritmo del avión que oyes encima de ti.",
+
+    "ej. Calle Ejemplo 12, 28001 Madrid",
+
+    "Configuración completada",
+    "El proceso de configuración ya ha finalizado. Todos los datos se han guardado en la tarjeta SD, en la carpeta ",
+    ". A partir del próximo inicio, el WiFi se conectará automáticamente.",
 };
 
 static_assert(sizeof(I18N_ES) / sizeof(I18N_ES[0]) == (size_t)StringId::COUNT,