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>

platformio.ini

@@ -94,8 +94,11 @@ build_src_filter =
 	+<esp32/logic/boot_policy.cpp>
 	+<esp32/system/system_store.cpp>
 	+<esp32/system/boot_target.cpp>
-build_flags = -I src/esp32
-lib_deps =
+	+<esp32/nano_link/nano_link.cpp>
+	+<esp32/display/status_screen.cpp>
+	+<esp32/display/text.cpp>
+; ESPSERIAL: status messages are sent to the Nano like in the clock firmware
+build_flags = -D ESPSERIAL -I src/esp32
 upload_protocol = esptool
 upload_port = COM11