Add mute and unmute functionality to video previews on cards

Integrates a mute/unmute toggle button into the video card component, allowing users to control audio during video previews. The state is managed with `useState` and the video element's `muted` property is updated accordingly.

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-b99d3897a0d1/4DOsXkx

client/src/components/video-card.tsx

@@ -1,4 +1,4 @@
-import { Play } from "lucide-react";
+import { Play, Volume2, VolumeX } from "lucide-react";
 import { type Video } from "@shared/schema";
 import { useState, useRef, useEffect } from "react";
 import Hls from "hls.js";
@@ -46,6 +46,7 @@ function formatDate(date: Date | string): string {
 export default function VideoCard({ video, onClick, className = "", hideOverlay = false }: VideoCardProps) {
   const [isHovered, setIsHovered] = useState(false);
   const [showPreview, setShowPreview] = useState(false);
+  const [isMuted, setIsMuted] = useState(true);
   const hoverTimeoutRef = useRef<NodeJS.Timeout>();
   const videoRef = useRef<HTMLVideoElement>(null);
   const hlsRef = useRef<Hls | null>(null);
@@ -171,7 +172,7 @@ export default function VideoCard({ video, onClick, className = "", hideOverlay
                 objectFit: 'cover'
               }}
               autoPlay
-              muted={window.innerWidth >= 768 ? false : true}
+              muted={isMuted}
               loop
               playsInline
               controls={false}
@@ -192,6 +193,26 @@ export default function VideoCard({ video, onClick, className = "", hideOverlay
               }}
             />
             
+            {/* Mute/Unmute button */}
+            <button
+              onClick={(e) => {
+                e.preventDefault();
+                e.stopPropagation();
+                setIsMuted(!isMuted);
+                if (videoRef.current) {
+                  videoRef.current.muted = !isMuted;
+                }
+              }}
+              className="absolute top-2 right-2 z-20 bg-black/50 hover:bg-black/70 text-white border-none p-2 rounded-full transition-all duration-200 opacity-75 hover:opacity-100"
+              data-testid="button-mute-toggle"
+            >
+              {isMuted ? (
+                <VolumeX className="w-4 h-4" />
+              ) : (
+                <Volume2 className="w-4 h-4" />
+              )}
+            </button>
+            
             {/* Video scrubbing progress bar - only show during preview */}
             {duration > 0 && (
               <div className="absolute bottom-1 left-2 right-2 h-2 bg-black/40 rounded-full overflow-hidden backdrop-blur-sm border border-white/20">