add sign in redirect path (#5746)

apps/frontend/src/providers/setup/auth.ts

@@ -2,8 +2,11 @@ import type { Labrinth } from '@modrinth/api-client'
 import { type AuthProvider, provideAuth } from '@modrinth/ui'
 import { ref, watchEffect } from 'vue'
 
+import { getSignInRedirectPath } from '~/composables/auth.js'
+
 export function setupAuthProvider(auth: Awaited<ReturnType<typeof useAuth>>) {
 	const router = useRouter()
+	const route = useRoute()
 	const sessionToken = ref<string | null>(null)
 	const user = ref<Labrinth.Users.v2.User | null>(null)
 
@@ -14,7 +17,7 @@ export function setupAuthProvider(auth: Awaited<ReturnType<typeof useAuth>>) {
 			await router.push({
 				path: '/auth/sign-in',
 				query: {
-					redirect: redirectPath,
+					redirect: redirectPath || getSignInRedirectPath(route),
 				},
 			})
 		},