feature: move all shadcn related code to src/shared/shadcn

src/shared/shadcn/hooks/is-mobile.svelte.ts

@@ -0,0 +1,9 @@
+import { MediaQuery } from 'svelte/reactivity';
+
+const DEFAULT_MOBILE_BREAKPOINT = 768;
+
+export class IsMobile extends MediaQuery {
+    constructor(breakpoint: number = DEFAULT_MOBILE_BREAKPOINT) {
+        super(`max-width: ${breakpoint - 1}px`);
+    }
+}