feat(account): add ability to sign in with login code (#271)

Co-authored-by: Elias Schneider <login@eliasschneider.com>

frontend/src/routes/lc/+server.ts

@@ -0,0 +1,10 @@
+import { redirect } from '@sveltejs/kit';
+
+// Alias for /login/alternative/code
+export function GET({ url }) {
+	let targetPath = '/login/alternative/code';
+	if (url.searchParams.has('redirect')) {
+		targetPath += `?redirect=${encodeURIComponent(url.searchParams.get('redirect')!)}`;
+	}
+	return redirect(307, targetPath);
+}

frontend/src/routes/lc/[code]/+server.ts

@@ -0,0 +1,15 @@
+import { redirect } from '@sveltejs/kit';
+
+// Alias for /login/alternative/code?code=...
+export function GET({ url, params }) {
+	const targetPath = '/login/alternative/code';
+
+	const searchParams = new URLSearchParams();
+	searchParams.set('code', params.code);
+
+	if (url.searchParams.has('redirect')) {
+		searchParams.set('redirect', url.searchParams.get('redirect')!);
+	}
+
+	return redirect(307, `${targetPath}?${searchParams.toString()}`);
+}