Add HA dropdowns, off image, flip fixes and refresh effects

Home Assistant: remove the Clock switch (its entity is deleted on connect),
add an IP sensor and Mode / Off image dropdowns whose options follow the
saved bitmaps. Remove the built-in "Nintendo border" bitmap.

Off image: a bitmap (or blank) left on the dots when the display switches off.

Nano: pause after each flip pulse and repeat pulses for changed dots, both
stored in EEPROM (G/N commands). Refresh effects (E command): instant,
sparkle, wipe, rain, from the middle out, diagonal, spiral, flip all then
reveal, push and random, optionally only for small changes. Effects run in
steps from loop() so serial input keeps flowing.

Web UI: flip settings, refresh effect and test patterns under Settings; the
System tab shows why the ESP32 last restarted. Settings records from
versions 1 and 2 are migrated. Firmware 2.3.0.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/esp32/logic/display_controller.cpp

@@ -14,6 +14,11 @@ void DisplayController::setSettings(const ScheduleSettings &schedule, const Cloc
 	_content_revision++; // e.g. evening time changed: redraw
 }
 
+void DisplayController::setEffectTime(uint32_t ms)
+{
+	_effect_time = ms;
+}
+
 void DisplayController::setPage(Page page)
 {
 	_page = page;
@@ -43,21 +48,11 @@ bool DisplayController::liveActive() const
 	return _live;
 }
 
-void DisplayController::setClockEnabled(bool enabled)
-{
-	_clock_enabled = enabled;
-}
-
 void DisplayController::setPowerEnabled(bool enabled)
 {
 	_power_enabled = enabled;
 }
 
-bool DisplayController::clockEnabled() const
-{
-	return _clock_enabled;
-}
-
 bool DisplayController::powerEnabled() const
 {
 	return _power_enabled;
@@ -92,8 +87,8 @@ void DisplayController::update(uint32_t now, bool time_valid, int hour, int minu
 	{
 		if (_power.isOn())
 		{
-			_showOnce(Screen::Blank);
-			_off_timer.request(now, CLEAR_BEFORE_OFF_TIME);
+			_showOnce(Screen::Off);
+			_off_timer.request(now, CLEAR_BEFORE_OFF_TIME + _effect_time);
 		}
 		return;
 	}
@@ -111,23 +106,12 @@ void DisplayController::update(uint32_t now, bool time_valid, int hour, int minu
 	if (!time_valid)
 		return;
 
-	if (!_clock_enabled)
-	{
-		// The logo is only shown while the display is on; it never switches the power on
-		if (_power.isOn())
-		{
-			_showOnce(Screen::Logo);
-			_off_timer.request(now, POWER_OFF_DELAY);
-		}
-		return;
-	}
-
 	switch (scheduleFor(hour, minute, _schedule))
 	{
 	case ScheduleMode::Night:
 		if (_power.isOn())
 		{
-			_showOnce(Screen::Blank);
+			_showOnce(Screen::Off);
 			_off_timer.request(now, POWER_OFF_DELAY);
 		}
 		break;
@@ -186,11 +170,8 @@ void DisplayController::_showOnce(Screen screen)
 	case Screen::Live:
 		_frames.live();
 		break;
-	case Screen::Logo:
-		_frames.logo();
-		break;
 	default:
-		_frames.blank();
+		_frames.off();
 		break;
 	}
 	_screen = screen;