Add T-Beam WiFi button toggle

docs/WiFi.md

@@ -181,6 +181,12 @@ service on ports 5001 and 5002. See the
 [full Companion guide](./companion_radio_full.md) for its build, terminal mode,
 and complete update-source workflow.
 
+The LilyGo T-Beam 1W Full Companion maps a triple click of the physical button
+labeled `17` to a persistent WiFi on/off toggle. Turning WiFi off closes the
+WebConfig, Companion TCP, mOTA, and MQTT network services while USB, BLE, the
+display, GPS, and LoRa remain available. The same triple click turns WiFi back
+on even after reboot.
+
 The companion loads runtime credentials saved in NVS. A non-placeholder
 compile-time `WIFI_SSID`/`WIFI_PWD` can be used as a first-boot fallback, but
 saved credentials take priority. With no credentials, its WebConfig portal

docs/companion_radio_full.md

@@ -80,6 +80,13 @@ clock and keeps GPS awake. Full Companion transports remain available in both
 states; WiFi modem sleep stays enabled when BLE is present because coexistence
 requires it. The selected state is retained after reboot.
 
+On the LilyGo T-Beam 1W Full Companion, triple-click the physical button
+labeled `17` to turn the ESP32 WiFi radio and all WiFi services off or on. The
+screen confirms `WiFi: OFF` or `WiFi: ON`, and the selected state is retained
+after reboot. When WiFi is off, TCP ports 5000-5002, WebConfig, and MQTT are
+stopped; USB, BLE, the display, GPS, and LoRa continue to operate. Triple-click
+button 17 again to restore WiFi, including the saved station or setup-AP mode.
+
 Artifacts are written to `out/` by default.
 
 On 4 MB ESP32 boards, the full target uses a single 3 MB application