feat: first MVP

src/lib/Cell.svelte

@@ -0,0 +1,14 @@
+<script lang="ts">
+	let { value, selected, disabled, onclick } = $props();
+</script>
+
+<button
+	class="aspect-square rounded-4xl border"
+	class:bg-amber-600={selected}
+	class:bg-gray-200={disabled}
+	class:cursor-pointer={!disabled}
+	{onclick}
+	{disabled}
+>
+	{value || '-'}
+</button>