refactor(svelte): cleanup components

packages/svelte/src/lib/container/Viewport/Viewport.svelte

@@ -0,0 +1,25 @@
+<script lang="ts">
+  import { useStore } from '$lib/store';
+
+  const { transform } = useStore();
+</script>
+
+<div
+  class="react-flow__viewport"
+  style="transform: translate({$transform[0]}px, {$transform[1]}px) scale({$transform[2]})"
+>
+  <slot />
+</div>
+
+<style>
+  .react-flow__viewport {
+    width: 100%;
+    height: 100%;
+    position: absolute;
+    transform-origin: 0 0;
+    top: 0;
+    left: 0;
+    z-index: 2;
+    pointer-events: none;
+  }
+</style>

packages/svelte/src/lib/container/Viewport/index.ts

@@ -0,0 +1 @@
+export { default as Viewport } from './Viewport.svelte';