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

libraries/KlubhausCore/src/ScreenState.h

@@ -5,9 +5,12 @@ enum class DeviceState { BOOTED, SILENT, ALERTING, SILENCED };
 
 enum class ScreenID { BOOT, OFF, ALERT, DASHBOARD };
 
+enum class BootStage { SPLASH, INIT_DISPLAY, INIT_NETWORK, CONNECTING_WIFI, READY, DONE };
+
 struct ScreenState {
     DeviceState deviceState = DeviceState::BOOTED;
     ScreenID screen = ScreenID::BOOT;
+    BootStage bootStage = BootStage::SPLASH;
 
     String alertTitle;
     String alertBody;
@@ -52,3 +55,21 @@ inline const char* screenIdStr(ScreenID s) {
     }
     return "?";
 }
+
+inline const char* bootStageStr(BootStage s) {
+    switch(s) {
+    case BootStage::SPLASH:
+        return "SPLASH";
+    case BootStage::INIT_DISPLAY:
+        return "INIT_DISPLAY";
+    case BootStage::INIT_NETWORK:
+        return "INIT_NETWORK";
+    case BootStage::CONNECTING_WIFI:
+        return "CONNECTING_WIFI";
+    case BootStage::READY:
+        return "READY";
+    case BootStage::DONE:
+        return "DONE";
+    }
+    return "?";
+}