refined infinite article grid and added article filtering

src/lib/validation/zod/article.ts

@@ -12,3 +12,9 @@ export const articleSchema = z.object({
 export const createArticleSchema = articleSchema.pick({
   title: true,
 });
+
+export const articleFilterSchema = z.object({
+  query: z.string().optional(),
+  category: z.string().optional(),
+  sort: z.string().optional(),
+});