feat(touch): add continuous touch polling and debug logging

boards/esp32-32e-4/DisplayDriverTFT.cpp

@@ -10,15 +10,18 @@ void DisplayDriverTFT::begin() {
     _tft.fillScreen(TFT_BLACK);
 
     Serial.printf("[GFX] Display OK: %dx%d\n", DISPLAY_WIDTH, DISPLAY_HEIGHT);
+    Serial.flush();
 
     // Debug: check if touch controller is responding
     uint16_t z = _tft.getTouchRawZ();
     Serial.printf("[TOUCH] Raw Z=%d (non-zero = controller detected)\n", z);
+    Serial.flush();
 
     drawBoot();
 
     digitalWrite(PIN_LCD_BL, HIGH);
     Serial.println("[GFX] Backlight ON");
+    Serial.flush();
 }
 
 void DisplayDriverTFT::setBacklight(bool on) { digitalWrite(PIN_LCD_BL, on ? HIGH : LOW); }
@@ -132,6 +135,10 @@ TouchEvent DisplayDriverTFT::readTouch() {
     return evt;
 }
 
+uint16_t DisplayDriverTFT::getRawTouchZ() {
+    return _tft.getTouchRawZ();
+}
+
 int DisplayDriverTFT::dashboardTouch(int x, int y) {
     // 2x2 grid, accounting for 30px header
     if(y < 30)