Refresh weather display when debug units dropdown changes

index.html

@@ -1492,6 +1492,8 @@ window.weatherThemes = {
 
         function setDebugUnits(units) {
             window.CONFIG.units = units;
+            // Refresh weather to display new units
+            if (typeof fetchWeather === 'function') fetchWeather();
         }
 
         function updateDebug(t, palette, vantaColors, themeName, realDayProgress) {