refactor(svelte): simplify nodes and edges store handling

packages/svelte/src/lib/components/SvelteFlowProvider/SvelteFlowProvider.svelte

@@ -1,22 +1,9 @@
 <script lang="ts">
-  import { onDestroy, setContext } from 'svelte';
+  import { onDestroy } from 'svelte';
   
-  import { createStore, key } from '$lib/store';
-  import type { SvelteFlowProviderProps } from './types';
-
-  type $$Props = SvelteFlowProviderProps;
-
-  export let nodes: $$Props['nodes'];
-  export let edges: $$Props['edges'];
-
-  const store = createStore({
-    nodes,
-    edges,
-  });
-
-  setContext(key, {
-    getStore: () => store
-  });
+  import { createStoreContext } from '$lib/store';
+  
+  const store = createStoreContext();
 
   onDestroy(() => {
     store.reset();

packages/svelte/src/lib/components/SvelteFlowProvider/index.ts

@@ -1,2 +1 @@
 export { default as SvelteFlowProvider } from './SvelteFlowProvider.svelte';
-export type { SvelteFlowProviderProps } from './types';

packages/svelte/src/lib/components/SvelteFlowProvider/types.ts

@@ -1,9 +0,0 @@
-import type { Writable } from 'svelte/store';
-
-import type { Edge } from '$lib/types';
-import type { createNodes } from '$lib/utils';
-
-export type SvelteFlowProviderProps = {
-  nodes: ReturnType<typeof createNodes>;
-  edges: Writable<Edge[]>;
-};