Restore the V4 WiFi setup QR with a one-pixel border

src/helpers/ui/DisplayDriver.cpp

@@ -5,9 +5,15 @@
 #include <qrcode.h>
 
 bool DisplayDriver::drawQrCode(const char* text, int x, int y, int size) {
+  return drawQrCodeWithBorder(text, x, y, size, -1);
+}
+
+bool DisplayDriver::drawQrCodeWithBorder(const char* text, int x, int y,
+                                        int size, int border_pixels) {
   if (text == nullptr || text[0] == 0 || x < 0 || y < 0 || size <= 0
       || size > width() || size > height()
-      || x > width() - size || y > height() - size) {
+      || x > width() - size || y > height() - size
+      || border_pixels < -1 || border_pixels > (size - 1) / 2) {
     return false;
   }
 
@@ -28,13 +34,17 @@ bool DisplayDriver::drawQrCode(const char* text, int x, int y, int size) {
   if (!initialized) return false;
 
   static constexpr int quiet_zone = 4;
-  const int module_size = size / (qr.size + quiet_zone * 2);
+  const int module_size = border_pixels < 0
+      ? size / (qr.size + quiet_zone * 2)
+      : (size - border_pixels * 2) / qr.size;
   if (module_size <= 0) return false;
-  const int used_size = module_size * (qr.size + quiet_zone * 2);
+  const int border = border_pixels < 0
+      ? quiet_zone * module_size : border_pixels;
+  const int used_size = module_size * qr.size + border * 2;
   const int left = x + (size - used_size) / 2;
   const int top = y + (size - used_size) / 2;
-  const int matrix_left = left + quiet_zone * module_size;
-  const int matrix_top = top + quiet_zone * module_size;
+  const int matrix_left = left + border;
+  const int matrix_top = top + border;
 
   // Dark-theme OLED/TFT drivers use a dark window and light popup text;
   // e-paper reverses that convention. Always emit the conventional dark
@@ -42,7 +52,10 @@ bool DisplayDriver::drawQrCode(const char* text, int x, int y, int size) {
   const ColorVal light = isEink() ? UIColor::window_bkg : UIColor::popup_txt;
   const ColorVal dark = isEink() ? UIColor::primary_txt : UIColor::window_bkg;
   setColor(light);
-  fillRect(x, y, size, size);
+  // An explicit border is exact, even if a larger QR version leaves unused
+  // space in the requested square. Do not add that space to the white border.
+  if (border_pixels < 0) fillRect(x, y, size, size);
+  else fillRect(left, top, used_size, used_size);
   setColor(dark);
   for (uint8_t row = 0; row < qr.size; ++row) {
     for (uint8_t column = 0; column < qr.size; ++column) {

src/helpers/ui/DisplayDriver.h

@@ -74,6 +74,10 @@ public:
   // fallback layout in place.
 #if defined(ESP32_PLATFORM) && defined(MESHCORE_HAS_REAL_DISPLAY)
   virtual bool drawQrCode(const char* text, int x, int y, int size);
+  // Explicit pixel border for compact setup screens; -1 keeps the normal
+  // four-module quiet zone. The matrix always uses whole pixels.
+  virtual bool drawQrCodeWithBorder(const char* text, int x, int y, int size,
+                                    int border_pixels);
 #else
   virtual bool drawQrCode(const char* text, int x, int y, int size) {
     (void)text;
@@ -82,6 +86,15 @@ public:
     (void)size;
     return false;
   }
+  virtual bool drawQrCodeWithBorder(const char* text, int x, int y, int size,
+                                    int border_pixels) {
+    (void)text;
+    (void)x;
+    (void)y;
+    (void)size;
+    (void)border_pixels;
+    return false;
+  }
 #endif
   virtual uint16_t getTextWidth(const char* str) = 0;
   virtual bool getTouch(int* x, int* y) {

src/helpers/ui/WiFiSetupQrDisplay.h

@@ -13,7 +13,8 @@ namespace ui {
 // panels so a normal setup IP has the full 66-pixel text row beside it.
 // Returns false when the payload or panel geometry cannot be represented.
 inline bool drawWiFiSetupQr(DisplayDriver& display, const char* ssid,
-                            const char* address) {
+                            const char* address, bool compact_border = false,
+                            const char* action = nullptr) {
   char payload[256];
   const char* password = nullptr;
 #ifdef WEBCONFIG_AP_PASSWORD
@@ -27,18 +28,24 @@ inline bool drawWiFiSetupQr(DisplayDriver& display, const char* ssid,
   int qr_size = display.height() < display.width() / 2
       ? display.height() : display.width() / 2;
   static constexpr int compact_qr_size = (21 + 4 * 2) * 2;
-  if (display.height() == 64 && qr_size >= compact_qr_size) {
+  if (compact_border && qr_size >= 44) {
+    // Version 1: 21 modules at 2 pixels, plus an exact one-pixel border.
+    qr_size = 44;
+  } else if (display.height() == 64 && qr_size >= compact_qr_size) {
     qr_size = compact_qr_size;
   }
-  if (!display.drawQrCode(payload, 0, 0, qr_size)) return false;
+  const bool rendered = compact_border
+      ? display.drawQrCodeWithBorder(payload, 0, 0, qr_size, 1)
+      : display.drawQrCode(payload, 0, 0, qr_size);
+  if (!rendered) return false;
 
   const int text_x = qr_size + 4;
   display.setTextSize(1);
   display.setColor(UIColor::primary_txt);
   display.setCursor(text_x, 2);
-  display.print("SCAN TO");
+  display.print(action ? "SCAN JOIN" : "SCAN TO");
   display.setCursor(text_x, 12);
-  display.print("JOIN:");
+  display.print(action ? action : "JOIN:");
   display.drawTextEllipsized(
       text_x, 22, display.width() - text_x, ssid);
   display.setCursor(text_x, 37);