Update video player navigation buttons with new colors and styles

Refactors VideoCard and VideoPreviewThumbnail components, updates navigation buttons on VideoPage with a new gradient style, and modifies the company logo's styling on the Home page.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 2cd2c0bc-434c-4bc9-ad3f-b99d3897a0d1
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/8cc42625-c1f5-4e43-99bd-77f2c4dedee2/2cd2c0bc-434c-4bc9-ad3f-b99d3897a0d1/d05DGZF

client/src/pages/home.tsx

@@ -215,8 +215,8 @@ export default function Home() {
             {/* Company Info */}
             <div className="col-span-1">
               <div className="flex items-center space-x-2 mb-4">
-                <div className="w-8 h-8 gradient-primary rounded-lg flex items-center justify-center">
-                  <div className="w-0 h-0 border-l-[8px] border-l-white border-y-[6px] border-y-transparent ml-1"></div>
+                <div className="w-8 h-8 bg-gradient-to-r from-purple-600 to-blue-500 rounded-lg flex items-center justify-center shadow-lg">
+                  <div className="w-0 h-0 border-l-[8px] border-l-white border-y-[6px] border-y-transparent ml-1 drop-shadow-sm"></div>
                 </div>
                 <h3 className="text-xl font-bold text-white">go4.video</h3>
               </div>