Implement initial application structure and UI.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 9111ef36-26c8-4085-84ca-a35dc1fec1b5
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/7083d608-d6d3-4a6a-9a27-6286c5109627/54918520-d42c-44cd-b4f4-9e5a42eb5be1.jpg

client/src/lib/protected-route.tsx

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+import { useAuth } from "@/hooks/use-auth";
+import { Loader2 } from "lucide-react";
+import { Redirect, Route } from "wouter";
+
+export function ProtectedRoute({
+  path,
+  component: Component,
+}: {
+  path: string;
+  component: () => React.JSX.Element;
+}) {
+  const { user, isLoading } = useAuth();
+
+  if (isLoading) {
+    return (
+      <Route path={path}>
+        <div className="flex items-center justify-center min-h-screen">
+          <Loader2 className="h-8 w-8 animate-spin text-border" />
+        </div>
+      </Route>
+    );
+  }
+
+  if (!user) {
+    return (
+      <Route path={path}>
+        <Redirect to="/auth" />
+      </Route>
+    );
+  }
+
+  return <Route path={path} component={Component} />;
+}

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[0] 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))
+}