Add loading skeleton component and enhance loading animations in App

src/App.css

@@ -529,8 +529,60 @@
 @keyframes loading-shimmer {
   0% {
     background-position: -200% 0;
+    opacity: 0.8;
+  }
+  50% {
+    opacity: 1;
   }
   100% {
     background-position: 200% 0;
+    opacity: 0.8;
   }
 }
+
+@keyframes loading-wave {
+  0% {
+    left: -100%;
+  }
+  100% {
+    left: 100%;
+  }
+}
+
+@keyframes loading-pulse {
+  0%, 100% {
+    opacity: 0.6;
+  }
+  50% {
+    opacity: 1;
+  }
+}
+
+.loading-skeleton {
+  position: relative;
+  overflow: hidden;
+}
+
+.loading-skeleton::before {
+  content: '';
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.08), transparent);
+  animation: loading-wave 2s infinite ease-in-out;
+}
+
+/* Enhanced loading skeleton styles */
+.loading-skeleton {
+  position: relative;
+  overflow: hidden;
+  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
+  transition: all 0.3s ease;
+}
+
+.loading-skeleton:hover {
+  transform: translateY(-1px);
+  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
+}

src/App.tsx

@@ -24,6 +24,36 @@ interface Stats {
   totalKills: number
 }
 
+// Loading Skeleton Component
+const LoadingSkeleton = ({ width = '60px', height = '40px', className = '' }: { width?: string, height?: string, className?: string }) => (
+  <div
+    className={`loading-skeleton ${className}`}
+    style={{
+      width,
+      height,
+      background: 'linear-gradient(135deg, var(--bg-secondary) 0%, var(--border-color) 50%, var(--bg-secondary) 100%)',
+      backgroundSize: '200% 200%',
+      animation: 'loading-shimmer 2.5s infinite ease-in-out, loading-pulse 1.5s infinite ease-in-out',
+      borderRadius: '8px',
+      position: 'relative',
+      overflow: 'hidden',
+      boxShadow: '0 2px 8px rgba(0,0,0,0.08)'
+    }}
+  >
+    <div
+      style={{
+        position: 'absolute',
+        top: 0,
+        left: '-100%',
+        width: '100%',
+        height: '100%',
+        background: 'linear-gradient(90deg, transparent, rgba(255,255,255,0.12), transparent)',
+        animation: 'loading-wave 2.5s infinite ease-in-out'
+      }}
+    />
+  </div>
+)
+
 function App() {
   const { t } = useTranslation()
 
@@ -195,14 +225,7 @@ function App() {
             <div className="stat-icon">👥</div>
             <div className="stat-number">
               {loading ? (
-                <div style={{
+                <LoadingSkeleton width="70px" height="32px" />
-                  width: '60px',
-                  height: '40px',
-                  background: 'linear-gradient(90deg, var(--bg-secondary) 25%, var(--border-color) 50%, var(--bg-secondary) 75%)',
-                  backgroundSize: '200% 100%',
-                  animation: 'loading-shimmer 1.5s infinite',
-                  borderRadius: '4px'
-                }} />
               ) : (
                 stats.totalPlayers.toLocaleString()
               )}
@@ -213,14 +236,7 @@ function App() {
             <div className="stat-icon">🔗</div>
             <div className="stat-number">
               {loading ? (
-                <div style={{
+                <LoadingSkeleton width="70px" height="32px" />
-                  width: '60px',
-                  height: '40px',
-                  background: 'linear-gradient(90deg, var(--bg-secondary) 25%, var(--border-color) 50%, var(--bg-secondary) 75%)',
-                  backgroundSize: '200% 100%',
-                  animation: 'loading-shimmer 1.5s infinite',
-                  borderRadius: '4px'
-                }} />
               ) : (
                 stats.totalConnects.toLocaleString()
               )}
@@ -231,14 +247,7 @@ function App() {
             <div className="stat-icon">⏱️</div>
             <div className="stat-number">
               {loading ? (
-                <div style={{
+                <LoadingSkeleton width="90px" height="32px" />
-                  width: '80px',
-                  height: '40px',
-                  background: 'linear-gradient(90deg, var(--bg-secondary) 25%, var(--border-color) 50%, var(--bg-secondary) 75%)',
-                  backgroundSize: '200% 100%',
-                  animation: 'loading-shimmer 1.5s infinite',
-                  borderRadius: '4px'
-                }} />
               ) : (
                 formatPlayTime(stats.totalPlayTime)
               )}
@@ -249,14 +258,7 @@ function App() {
             <div className="stat-icon">🎯</div>
             <div className="stat-number">
               {loading ? (
-                <div style={{
+                <LoadingSkeleton width="70px" height="32px" />
-                  width: '60px',
-                  height: '40px',
-                  background: 'linear-gradient(90deg, var(--bg-secondary) 25%, var(--border-color) 50%, var(--bg-secondary) 75%)',
-                  backgroundSize: '200% 100%',
-                  animation: 'loading-shimmer 1.5s infinite',
-                  borderRadius: '4px'
-                }} />
               ) : (
                 stats.totalKills.toLocaleString()
               )}