Show status messages on the display

- Clock firmware: 'Connecting to WiFi...' and 'Getting the time...' at
  boot, 'Crashed!' in the OTA-only modes, and 'No WiFi' with the time
  when WiFi is down for over a minute (new DisplayController screen)
- Recovery app: shows its reason, the setup WiFi name, or its IP address,
  then powers the display off (flipdots keep the image)
- StatusScreen and drawTextLines shared by both apps
- Driver: ESP begin() no longer draws 'ESP Connected'
- Tests: No WiFi screen, short reason texts (70 total)

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

src/esp32/display/frames.h

@@ -11,11 +11,11 @@ public:
 
 	// Pikachu with a thought bubble showing HH:MM (yawning in the evening)
 	void clock(int hour, int minute) override;
+	// "No WiFi" with the time below it
+	void noWifi(int hour, int minute) override;
 	// Nintendo logo
 	void logo() override;
 	void blank() override;
-	// A line of text, e.g. while connecting
-	void message(const char *text);
 
 private:
 	BROSE9323 &_display;