feat: add PWA support (manifest, service worker, icons)

index.js

@@ -25,6 +25,7 @@ app.use(helmet({
       fontSrc: ["'self'", 'https://fonts.gstatic.com'],
       imgSrc: ["'self'", 'data:'],
       connectSrc: ["'self'", 'https://api.open-meteo.com'],
+      workerSrc: ["'self'"],
       frameAncestors: ["'none'"],
       objectSrc: ["'none'"],
     },
@@ -32,6 +33,10 @@ app.use(helmet({
 }));
 app.use(express.json());
 app.use(cookieParser());
+app.get('/sw.js', (req, res, next) => {
+  res.setHeader('Cache-Control', 'no-cache');
+  next();
+});
 app.use(express.static(path.join(__dirname, 'public')));
 app.use('/api', routes);
 app.use('/api/files', filesRouter);