Enable users to manage video playlists and mark favorite content

Adds new user, playlist, and favorites management API endpoints and React components.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 50814a1e-92e4-4968-856f-7bc7eedf5e8f
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/8cc42625-c1f5-4e43-99bd-77f2c4dedee2/50814a1e-92e4-4968-856f-7bc7eedf5e8f/hISDNbZ

client/src/pages/home.tsx

@@ -3,6 +3,7 @@ import { useQuery } from "@tanstack/react-query";
 import { type Video } from "@shared/schema";
 import SearchHeader from "@/components/search-header";
 import VideoGrid from "@/components/video-grid";
+import { Navigation } from "@/components/navigation";
 
 interface VideosResponse {
   videos: Video[];
@@ -91,6 +92,7 @@ export default function Home() {
 
   return (
     <div className="min-h-screen bg-bunny-dark">
+      <Navigation />
       <SearchHeader
         onSearch={handleSearch}
         onCategoryChange={handleCategoryChange}