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/first_run_complete_screen.cpp

@@ -0,0 +1,82 @@
+#include "first_run_complete_screen.h"
+#include "touch_input.h"
+#include "menu_stars.h"
+#include "config.h"
+#include "i18n.h"
+
+namespace FirstRunCompleteScreen {
+
+namespace {
+    struct Rect {
+        int16_t x, y, w, h;
+        bool contains(int16_t px, int16_t py) const {
+            return px >= x && px < x + w && py >= y && py < y + h;
+        }
+    };
+
+    int16_t layoutWrapped(TFT_eSPI& tft, int16_t x, int16_t startY, int16_t maxWidth,
+                           int16_t lineHeight, const String& text) {
+        int16_t y = startY;
+        int32_t start = 0;
+        int32_t len = text.length();
+        while (start < len) {
+            while (start < len && text[start] == ' ') start++;
+            if (start >= len) break;
+            String line = text.substring(start, len);
+            while (tft.textWidth(line) > maxWidth) {
+                int32_t lastSpace = line.lastIndexOf(' ');
+                if (lastSpace <= 0) break;
+                line = line.substring(0, lastSpace);
+            }
+            tft.setCursor(x, y);
+            tft.print(line);
+            y += lineHeight;
+            start += line.length();
+        }
+        return y;
+    }
+
+    void drawStartButton(TFT_eSPI& tft, const Rect& r) {
+        tft.fillRoundRect(r.x, r.y, r.w, r.h, 6, TFT_GREEN);
+        tft.drawRoundRect(r.x, r.y, r.w, r.h, 6, TFT_GREEN);
+        tft.setTextDatum(MC_DATUM);
+        tft.setTextColor(TFT_BLACK, TFT_GREEN);
+        tft.setTextSize(2);
+        int16_t cx = r.x + r.w / 2;
+        int16_t cy = r.y + r.h / 2;
+        tft.drawString("Flightradar", cx, cy);
+        tft.drawString("Flightradar", (int16_t)(cx + 1), cy);
+        tft.setTextSize(1);
+        tft.setTextDatum(TL_DATUM);
+    }
+}
+
+void run(TFT_eSPI& tft) {
+    MenuStars::reset();
+    tft.fillScreen(TFT_BLACK);
+    tft.setTextColor(TFT_GREEN, TFT_BLACK);
+    tft.setCursor(10, 14);
+    tft.println(I18n::t(StringId::FIRST_RUN_COMPLETE_TITLE));
+
+    tft.setTextColor(TFT_WHITE, TFT_BLACK);
+    String body = String(I18n::t(StringId::FIRST_RUN_COMPLETE_BODY1)) +
+                  Config::SD_ROOT_DIR +
+                  I18n::t(StringId::FIRST_RUN_COMPLETE_BODY2);
+    int16_t textEndY = layoutWrapped(tft, 10, 40, (int16_t)(Config::SCREEN_WIDTH - 20), 18, body);
+
+    constexpr int16_t BTN_H = 60;
+    int16_t btnY = (int16_t)(textEndY + 20);
+    int16_t maxBtnY = (int16_t)(Config::SCREEN_HEIGHT - (BTN_H + 20));
+    if (btnY > maxBtnY) btnY = maxBtnY;
+
+    Rect startBtn = {10, btnY, (int16_t)(Config::SCREEN_WIDTH - 20), BTN_H};
+    drawStartButton(tft, startBtn);
+
+    while (true) {
+        TouchInput::Point tap;
+        if (!TouchInput::wasTapped(tap)) { MenuStars::update(tft); delay(20); continue; }
+        if (startBtn.contains(tap.x, tap.y)) return;
+    }
+}
+
+}