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/main.cpp

@@ -31,6 +31,7 @@
 #include "i18n.h"
 #include "first_run_language_screen.h"
 #include "first_run_location_screen.h"
+#include "first_run_complete_screen.h"
 #include "menu_stars.h"
 #include "ui_font.h"
 #include <math.h>
@@ -496,6 +497,10 @@ void setup() {
         // oben (die Adresssuche braucht eine Internetverbindung) -
         // ueberspringbar, siehe first_run_location_screen.cpp.
         FirstRunLocationScreen::run(tft);
+        // Abschluss-Screen: bestaetigt das Ende der Ersteinrichtung, nennt
+        // den SD-Ordner mit allen gespeicherten Daten und weist auf den
+        // automatischen WLAN-Verbindungsaufbau ab dem naechsten Start hin.
+        FirstRunCompleteScreen::run(tft);
         SplashScreen::begin(tft);
         MenuStars::update(tft);
         SplashScreen::setStatusLine(tft, 0, I18n::t(StringId::SPLASH_SD_OK), TFT_WHITE);