fix: correct Waveshare touch pins, banner, test fills

- TOUCH_SDA=17 SCL=18 RST=38 per Waveshare schematic
- GPIO 8/9 conflict with LCD_B0/B3 was blanking the display
- Banner uses BOARD_NAME macro instead of hard-coded E32R35T
- TFT_eSPI #error wrapped in USE_TFT_ESPI guard
- RGB test fills on separate lines so they actually execute

sketches/doorbell-touch-esp32-32e/DisplayDriverGFX.cpp

@@ -38,7 +38,12 @@ void Gfx::init() {
     return;
   }
   Serial.printf("[GFX] Display OK: %dx%d\n", SCREEN_WIDTH, SCREEN_HEIGHT);
-_gfx->fillScreen(0xF800); // RED TEST  delay(2000);  _gfx->fillScreen(0x07E0); // GREEN TEST  delay(2000);  _gfx->fillScreen(0x001F); // BLUE TEST  delay(2000);
+  _gfx->fillScreen(0xF800); // RED TEST
+  delay(2000);
+  _gfx->fillScreen(0x07E0); // GREEN TEST
+  delay(2000);
+  _gfx->fillScreen(0x001F); // BLUE TEST
+  delay(2000);  _gfx->fillScreen(0x07E0); // GREEN TEST  delay(2000);  _gfx->fillScreen(0x001F); // BLUE TEST  delay(2000);
 }
 
 void Gfx::setRotation(uint8_t r)  { if (_gfx) _gfx->setRotation(r); }

sketches/doorbell-touch-esp32-32e/doorbell-touch-esp32-32e.ino

@@ -21,7 +21,9 @@
 #endif
 #if USE_TFT_ESPI
   #ifndef ST7796_DRIVER
-  #error "TFT_eSPI setup mismatch — ST7796_DRIVER expected for E32R35T"
+  #if USE_TFT_ESPI
+#error "TFT_eSPI setup mismatch — ST7796_DRIVER expected for E32R35T"
+#endif
   #endif
 #endif
 #define HOLD_TO_SILENCE_MS 1000