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/logic/boot_policy.h

@@ -59,6 +59,8 @@ enum class RecoveryReason : uint8_t
 };
 
 const char *recoveryReasonText(RecoveryReason reason);
+// At most 14 characters, for the flipdot display
+const char *recoveryReasonShort(RecoveryReason reason);
 
 // Power-on count: each power on within POWER_CYCLE_WINDOW of the previous one counts.
 // True when the next start should be the recovery app.