feat(doorbell): add staged boot sequence and refactor main loop

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

@@ -17,7 +17,10 @@ void DisplayDriverTFT::begin() {
     Serial.printf("[TOUCH] Raw Z=%d (non-zero = controller detected)\n", z);
     Serial.flush();
 
-    drawBoot();
+    ScreenState st;
+    st.screen = ScreenID::BOOT;
+    st.bootStage = BootStage::SPLASH;
+    drawBoot(st);
 
     digitalWrite(PIN_LCD_BL, HIGH);
     Serial.println("[GFX] Backlight ON");
@@ -29,15 +32,16 @@ void DisplayDriverTFT::setBacklight(bool on) { digitalWrite(PIN_LCD_BL, on ? HIG
 // ── Rendering ───────────────────────────────────────────────
 
 void DisplayDriverTFT::render(const ScreenState& st) {
-    if(st.screen != _lastScreen) {
+    if(st.screen != _lastScreen || (st.screen == ScreenID::BOOT && st.bootStage != _lastBootStage)) {
         _needsRedraw = true;
         _lastScreen = st.screen;
+        _lastBootStage = st.bootStage;
     }
 
     switch(st.screen) {
     case ScreenID::BOOT:
         if(_needsRedraw) {
-            drawBoot();
+            drawBoot(st);
             _needsRedraw = false;
         }
         break;
@@ -60,7 +64,9 @@ void DisplayDriverTFT::render(const ScreenState& st) {
     }
 }
 
-void DisplayDriverTFT::drawBoot() {
+void DisplayDriverTFT::drawBoot(const ScreenState& st) {
+    BootStage stage = st.bootStage;
+
     _tft.fillScreen(TFT_BLACK);
     _tft.setTextColor(TFT_WHITE, TFT_BLACK);
     _tft.setTextSize(2);
@@ -69,8 +75,29 @@ void DisplayDriverTFT::drawBoot() {
     _tft.setTextSize(1);
     _tft.setCursor(10, 40);
     _tft.print(BOARD_NAME);
-    _tft.setCursor(10, 60);
-    _tft.print("Booting...");
+
+    // Show boot stage status
+    _tft.setCursor(10, 70);
+    switch(stage) {
+    case BootStage::SPLASH:
+        _tft.print("Initializing...");
+        break;
+    case BootStage::INIT_DISPLAY:
+        _tft.print("Display OK");
+        break;
+    case BootStage::INIT_NETWORK:
+        _tft.print("Network init...");
+        break;
+    case BootStage::CONNECTING_WIFI:
+        _tft.print("Connecting WiFi...");
+        break;
+    case BootStage::READY:
+        _tft.print("All systems go!");
+        break;
+    case BootStage::DONE:
+        _tft.print("Ready!");
+        break;
+    }
 }
 
 void DisplayDriverTFT::drawAlert(const ScreenState& st) {