feat(*): Add sign in route with redirection to mydex

src/routes/signin/+page.svelte

@@ -0,0 +1,34 @@
+<script lang="ts">
+	import { onDestroy } from 'svelte';
+	import { user } from '$lib/stores/user.js';
+	import { type User } from '@supabase/auth-js';
+	import SignIn from '$lib/components/SignIn.svelte';
+	import { goto } from '$app/navigation';
+
+	export let data;
+	let { supabase } = data;
+	$: ({ supabase } = data);
+
+	let localUser: User | null;
+	const unsubscribe = user.subscribe((value) => {
+		localUser = value;
+	});
+	onDestroy(unsubscribe);
+
+	async function getUser() {
+		const {
+			data: { session }
+		} = await supabase.auth.getSession();
+
+		if (session) {
+			localUser = session.user;
+		} else {
+			localUser = null;
+		}
+
+		user.set(localUser);
+		goto('/mydex', { replace: true });
+	}
+</script>
+
+<SignIn {supabase} on:signedIn={getUser} />