refactor(doorbell): unify 2x2 grid touch logic and add progress bar

boards/esp32-s3-lcd-43/DisplayDriverGFX.cpp

@@ -110,31 +110,35 @@ TouchEvent DisplayDriverGFX::readTouch() {
 }
 
 int DisplayDriverGFX::dashboardTouch(int x, int y) {
-    // Simple 2x2 grid: 4 tiles
-    int col = (x < DISPLAY_WIDTH / 2) ? 0 : 1;
-    int row = (y < DISPLAY_HEIGHT / 2) ? 0 : 1;
-    return row * 2 + col;
+    // Unified 2x2 grid
+    int col = (x * 2) / DISPLAY_WIDTH;   // 0 or 1
+    int row = (y * 2) / DISPLAY_HEIGHT;  // 0 or 1
+    return row * 2 + col;  // 0, 1, 2, or 3
 }
 
 HoldState DisplayDriverGFX::updateHold(unsigned long holdMs) {
     TouchEvent ev = readTouch();
+    
     if (ev.pressed) {
         if (!_lastTouched) {
             _holdStart = millis();
             _lastTouched = true;
         }
         unsigned long elapsed = millis() - _holdStart;
+        float progress = constrain((float)elapsed / holdMs, 0.0f, 1.0f);
+        
         if (elapsed >= holdMs) {
-            return {false, true};
+            _lastTouched = false;
+            _holdStart = 0;
+            return {false, true, 1.0f};
         }
-        return {true, false};
+        return {true, false, progress};
     } else {
         _lastTouched = false;
         _holdStart = 0;
-        return {false, false};
+        return {false, false, 0.0f};
     }
 }
-
 void DisplayDriverGFX::updateHint() {
     // placeholder for idle hint animation
 }
@@ -240,7 +244,8 @@ void DisplayDriverGFX::drawAlert(const ScreenState& state) {
     _gfx->println("DOORBELL!");
     _gfx->setTextSize(3);
     _gfx->setCursor(100, 280);
-    _gfx->println(state.alertBody ? state.alertBody : "Someone is at the door");
+    const char* body = state.alertBody.c_str();
+    _gfx->println(state.alertBody.length() ? body : "Someone is at the door");
 }
 
 void DisplayDriverGFX::drawOff() {

boards/esp32-s3-lcd-43/board_config.h

@@ -31,7 +31,7 @@
 #define LCD_B4           10
 
 // ── I2C bus (shared: CH422G + GT911) ──
-#define I2C_MASTER_NUM   0
+#define I2C_MASTER_NUM   ((i2c_port_t)0)
 #define I2C_MASTER_SDA   8
 #define I2C_MASTER_SCL   9