refactor: rename frontend/ to web-player/ and format with prettier

Updates the compose build context, the Dockerfile header, the package
name and the docs. The compose service and container keep the name
frontend/musify-frontend, since nginx routes to http://frontend:3000.

The source files also carry the first prettier pass, so the rename and
the reformat land together for them.

web-player/src/hooks.server.ts

@@ -0,0 +1,44 @@
+import type { Handle } from '@sveltejs/kit';
+import {
+	decodeSession,
+	encodeSession,
+	refreshSession,
+	sessionCookieOptions,
+	SESSION_COOKIE
+} from '$lib/server/auth';
+import { authConfig } from '$lib/server/config';
+
+export const handle: Handle = async ({ event, resolve }) => {
+	let session = await decodeSession(event.cookies.get(SESSION_COOKIE));
+
+	if (
+		session &&
+		session.expiresAt - authConfig.refreshThresholdSeconds <= Math.floor(Date.now() / 1000)
+	) {
+		session = await refreshSession(session);
+		if (session) {
+			event.cookies.set(
+				SESSION_COOKIE,
+				await encodeSession(session),
+				sessionCookieOptions(event.url)
+			);
+		} else {
+			event.cookies.delete(SESSION_COOKIE, { path: '/' });
+		}
+	}
+
+	if (session) {
+		event.locals.user = {
+			sub: session.sub,
+			name: session.name,
+			email: session.email,
+			picture: session.picture
+		};
+		event.locals.accessToken = session.accessToken;
+	} else {
+		event.locals.user = null;
+		event.locals.accessToken = null;
+	}
+
+	return resolve(event);
+};