feat(types): add type definitions for svelte-virtual-list module

- Declare module "@sveltejs/svelte-virtual-list" with types
- Define VirtualListProps interface with items, height, itemHeight, start, and end
- Export VirtualList class extending SvelteComponent with typed props
- Define default slot with item parameter typed as any
- Provide type safety for usage of svelte-virtual-list in projects

Author: terwer

src/types/svelte-virtual-list.d.ts

@@ -0,0 +1,19 @@
+declare module "@sveltejs/svelte-virtual-list" {
+  import { SvelteComponent } from "svelte";
+
+  interface VirtualListProps {
+    items: any[];
+    height?: string | number;
+    itemHeight?: number;
+    start?: number;
+    end?: number;
+  }
+
+  export default class VirtualList extends SvelteComponent<VirtualListProps> {
+    $$slots: {
+      default: {
+        item: any;
+      };
+    };
+  }
+}