Add core UI components and layout for media platform

Initializes the client-side application with fundamental UI components, including navigation, cards for articles and auctions, and various elements for user interaction and display.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 069d4324-6c40-4355-955e-c714a50de1ea
Replit-Commit-Checkpoint-Type: intermediate_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/3df548ff-50ae-432f-9be4-25d34eccc983/069d4324-6c40-4355-955e-c714a50de1ea/bVdKIaU

client/src/lib/authUtils.ts

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+export function isUnauthorizedError(error: Error): boolean {
+  return /^401: .*Unauthorized/.test(error.message);
+}

client/src/lib/queryClient.ts

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+import { QueryClient, QueryFunction } from "@tanstack/react-query";
+
+async function throwIfResNotOk(res: Response) {
+  if (!res.ok) {
+    const text = (await res.text()) || res.statusText;
+    throw new Error(`${res.status}: ${text}`);
+  }
+}
+
+export async function apiRequest(
+  method: string,
+  url: string,
+  data?: unknown | undefined,
+): Promise<Response> {
+  const res = await fetch(url, {
+    method,
+    headers: data ? { "Content-Type": "application/json" } : {},
+    body: data ? JSON.stringify(data) : undefined,
+    credentials: "include",
+  });
+
+  await throwIfResNotOk(res);
+  return res;
+}
+
+type UnauthorizedBehavior = "returnNull" | "throw";
+export const getQueryFn: <T>(options: {
+  on401: UnauthorizedBehavior;
+}) => QueryFunction<T> =
+  ({ on401: unauthorizedBehavior }) =>
+  async ({ queryKey }) => {
+    const res = await fetch(queryKey.join("/") as string, {
+      credentials: "include",
+    });
+
+    if (unauthorizedBehavior === "returnNull" && res.status === 401) {
+      return null;
+    }
+
+    await throwIfResNotOk(res);
+    return await res.json();
+  };
+
+export const queryClient = new QueryClient({
+  defaultOptions: {
+    queries: {
+      queryFn: getQueryFn({ on401: "throw" }),
+      refetchInterval: false,
+      refetchOnWindowFocus: false,
+      staleTime: Infinity,
+      retry: false,
+    },
+    mutations: {
+      retry: false,
+    },
+  },
+});

client/src/lib/utils.ts

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+import { clsx, type ClassValue } from "clsx"
+import { twMerge } from "tailwind-merge"
+
+export function cn(...inputs: ClassValue[]) {
+  return twMerge(clsx(inputs))
+}