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

sketches/doorbell-touch/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)

sketches/doorbell-touch/boards/esp32-32e-4/DisplayDriverTFT.h

@@ -11,6 +11,7 @@ public:
     void setBacklight(bool on) override;
     void render(const ScreenState& state) override;
     TouchEvent readTouch() override;
+    uint16_t getRawTouchZ();
     int dashboardTouch(int x, int y) override;
     HoldState updateHold(unsigned long holdMs) override;
     void updateHint(int x, int y, bool active) override;

sketches/doorbell-touch/boards/esp32-32e-4/esp32-32e-4.ino

@@ -21,6 +21,20 @@ void setup() {
 }
 
 void loop() {
+    // ── Touch debug: poll continuously ──
+    TouchEvent evt = display.readTouch();
+    if(evt.pressed) {
+        Serial.printf("[TOUCH] pressed: x=%d, y=%d\n", evt.x, evt.y);
+    } else {
+        // Debug: print raw Z even when not touched, to see controller state
+        static uint32_t lastDebug = 0;
+        if(millis() - lastDebug > 2000) {
+            lastDebug = millis();
+            uint16_t z = tftDriver.getRawTouchZ();
+            Serial.printf("[TOUCH] Raw Z=%d\n", z);
+        }
+    }
+
     // ── State machine tick ──
     logic.update();
 
@@ -68,4 +82,7 @@ void loop() {
         if(cmd.length() > 0)
             logic.onSerialCommand(cmd);
     }
+
+    // Yield to WiFi/BT stack (prevents Task Watchdog timeout)
+    delay(10);
 }

sketches/doorbell-touch/boards/esp32-32e-4/tft_user_setup.h

@@ -27,6 +27,7 @@
 
 // ── Touch (XPT2046 resistive) ──
 #define TOUCH_CS 33
+#define TOUCH_IRQ 36
 
 // ── SPI speed ──
 #define SPI_FREQUENCY 40000000