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_en.h

@@ -222,6 +222,12 @@ static const char* const I18N_EN[] = {
     "Skip",
 
     "Tip: use the \"Search by address\" button when adding a preset (\"+\") to get exact coordinates for your address instantly - much more accurate than automatic IP-based location, which can easily be 20-30 km off. With your exact location set, the proximity LED really does blink in sync with the aircraft you can hear overhead.",
+
+    "e.g. Main Street 12, 12345 Springfield",
+
+    "Setup Complete",
+    "The setup process is now complete. All data has been saved to the SD card in the folder ",
+    ". From the next boot, WiFi will connect automatically.",
 };
 
 static_assert(sizeof(I18N_EN) / sizeof(I18N_EN[0]) == (size_t)StringId::COUNT,