refactor: update weatherWidgetFlag decision logic to use NEXT_PUBLIC_FEATURE_X_ENABLED environment variable

Author: py-dev-nandini-12

src/app/flags.ts

@@ -3,5 +3,5 @@ import { flag } from "flags/next";
 export const weatherWidgetFlag = flag<boolean>({
   key: "weather-widget",
   description: "Enable the weather widget for users.",
-  decide: () => process.env.WEATHER_WIDGET_ENABLED === "true",
+  decide: () => process.env.NEXT_PUBLIC_FEATURE_X_ENABLED === "true",
 });

src/app/page.tsx

@@ -1,4 +1,3 @@
-
 import { weatherWidgetFlag } from "../../flags";
 import WeatherWidget from "./weather-widget";