feat(lenis): add smooth scroll solution

src/shared/lib/helpers/createScrollContext/createScrollContext.svelte.ts

@@ -0,0 +1,32 @@
+import Lenis from 'lenis';
+import {
+    getContext,
+    setContext,
+} from 'svelte';
+
+const LENIS_KEY = Symbol('lenis');
+
+export function createLenisContext() {
+    let lenis = $state<Lenis | null>(null);
+
+    return {
+        get lenis() {
+            return lenis;
+        },
+        setLenis(instance: Lenis) {
+            lenis = instance;
+        },
+        destroyLenis() {
+            lenis?.destroy();
+            lenis = null;
+        },
+    };
+}
+
+export function setLenisContext(context: ReturnType<typeof createLenisContext>) {
+    setContext(LENIS_KEY, context);
+}
+
+export function getLenisContext() {
+    return getContext<ReturnType<typeof createLenisContext>>(LENIS_KEY);
+}