Update .env.example to use wlan0 IP as default

- Set CONTROL_SERVER_URI to ws://10.42.0.1:8765 (wlan0 IP)
- Better default for remote connections from desktop
- Add comments for localhost and custom IP options

.env.example

@@ -3,9 +3,11 @@
 # WebSocket URI for the control server
 # Used by UI client and test scripts to connect to the control server
 #
-# For local development (running on same machine as control server):
-CONTROL_SERVER_URI=ws://localhost:8765
+# Default: Use wlan0 IP for remote connections
+CONTROL_SERVER_URI=ws://10.42.0.1:8765
 #
-# For remote connection (running on different machine from control server):
-# Replace with your control server's IP address
-# CONTROL_SERVER_URI=ws://10.1.1.117:8765
+# For local development (running on same machine as control server):
+# CONTROL_SERVER_URI=ws://localhost:8765
+#
+# For custom IP (if your Pi has a different address):
+# CONTROL_SERVER_URI=ws://YOUR_PI_IP:8765