feat: major UI/UX overhaul, snippets system, and performance fixes

jest.setup.ts

@@ -31,15 +31,15 @@ Object.defineProperty(window, "IntersectionObserver", {
 
 // Polyfill Headers/Request/Response
 if (!global.Headers) {
-  // @ts-ignore
+  // @ts-expect-error - Polyfilling global Headers for jest environment
   global.Headers = Headers;
 }
 if (!global.Request) {
-  // @ts-ignore
+  // @ts-expect-error - Polyfilling global Request for jest environment
   global.Request = Request;
 }
 if (!global.Response) {
-  // @ts-ignore
+  // @ts-expect-error - Polyfilling global Response for jest environment
   global.Response = Response;
 }
 
@@ -49,13 +49,14 @@ jest.mock('next/server', () => {
   return {
     ...actual,
     NextResponse: {
-      json: (data: any, init?: any) => {
-        const res = new Response(JSON.stringify(data), init);
+      json: (data: Record<string, unknown>, init?: unknown) => {
+        // Use global Response from whatwg-fetch
+        const res = new (global as any).Response(JSON.stringify(data), init);
         res.headers.set('Content-Type', 'application/json');
         return res;
       },
       next: () => ({ headers: new Headers() }),
-      redirect: (url: string) => ({ headers: new Headers(), status: 302 }),
+      redirect: (_url: string) => ({ headers: new Headers(), status: 302 }),
     },
   };
 });