Fix Wi-Fi network configuration in settings server

The settings UI was correctly updating Wi-Fi networks in Redis, but not properly calling wifi.save_networks() which ensures proper handling before updating wpa_supplicant configuration.

🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>

Author: dbieber

gonotego/settings/server.py

@@ -175,9 +175,18 @@ def do_POST(self):
 
           try:
             settings.set(key, value)
-            # If we're updating WiFi networks, update the wpa_supplicant.conf file
+            # If we're updating WiFi networks, save networks and update the wpa_supplicant.conf file
             if key == 'WIFI_NETWORKS':
               try:
+                # Parse the value to ensure it's in the correct format
+                if isinstance(value, str):
+                  networks = json.loads(value)
+                else:
+                  networks = value
+                
+                # Save networks using the wifi module's function
+                wifi.save_networks(networks)
+                
                 # Update wpa_supplicant configuration using the wifi module
                 wifi.update_wpa_supplicant_config()
                 wifi.reconfigure_wifi()