fix: hotspot save now restarts AP immediately (down + 1s wait + up)

app.py

@@ -178,9 +178,18 @@ def hotspot_config_update():
                 ["sudo", "-n", "nmcli", "con", "mod", _HOTSPOT_PROFILE, "802-11-wireless-security.psk", password],
                 capture_output=True, text=True, timeout=10, check=True,
             )
-        return jsonify(message=f"Hotspot SSID updated to '{ssid}'."
-                               + (" Password saved." if password else "")
-                               + " Restart hotspot or device to apply.")
+        # Restart the hotspot so changes take effect immediately.
+        subprocess.run(
+            ["sudo", "-n", "nmcli", "con", "down", _HOTSPOT_PROFILE],
+            capture_output=True, text=True, timeout=10,
+        )
+        time.sleep(1)
+        subprocess.run(
+            ["sudo", "-n", "nmcli", "con", "up", _HOTSPOT_PROFILE],
+            capture_output=True, text=True, timeout=15, check=True,
+        )
+        return jsonify(message=f"Hotspot updated to '{ssid}' and restarted."
+                               + (" New password saved." if password else ""))
     except subprocess.CalledProcessError as e:
         return jsonify(error=f"Could not update hotspot: {e.stderr.strip() or 'nmcli failed'}"), 500