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/display/status_screen.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include "BROSE9323.h"
+#include "logic/settings.h"
 #include "nano_link/nano_link.h"
 
 // Short messages for situations outside the normal clock: booting, crashes, recovery app.
@@ -14,12 +15,19 @@ public:
 	// power off again once the dots have flipped: flipdots keep their image without power.
 	void show(const char *line1, const char *line2, bool keep_on = false);
 
-	// Flip time sent to the Nano with the first message (default FLIP_TIME)
-	void setFlipTime(uint16_t flip_time);
+	// How the Nano drives the dots, sent with the first message (default: FLIP_TIME and
+	// the DriveSettings defaults, so the recovery app always shows its messages instantly)
+	void setDrive(uint16_t flip_time, const DriveSettings &drive);
+	// Send them again (they changed), from loop()
+	void sendDrive();
+	// Sends changed drive settings once the display is on. Not while the Nano is flashed.
+	void loop();
 
 private:
 	BROSE9323 &_display;
 	NanoLink &_nano;
 	bool _started = false;
+	bool _drive_pending = false;
 	uint16_t _flip_time;
+	DriveSettings _drive;
 };