Preserve Wi-Fi reconnect backlogs by client IP

Retain same-IP replies and park one displaced IP backlog for 30 seconds using existing fixed buffers. Cancel old route-owned operations on takeover, preserve partial TCP frames, and cover reconnect isolation and queue limits with regression tests.

.github/workflows/run-unit-tests.yml

@@ -155,6 +155,8 @@ jobs:
       - name: Verify WiFi, ESP-NOW and combined wireless controls
         run: |
           python3 -B test/test_wireless_control.py -v
+          python3 -B test/test_serial_wifi_sessions.py -v
+          python3 -B test/test_companion_wifi_session.py -v
           python3 -B test/test_espnow_radio_lifecycle.py -v
 
       - name: Verify message reader buttons, touch targets, and footer layouts