修复前端瀑布流动画

web/src/lib/components/photo/PhotoCard.svelte

@@ -7,10 +7,11 @@
 	 * @property {(photoId: number, previewSrc: string) => void} [onUpgradeQuality]
 	 * @property {boolean} [borderLess]
 	 * @property {boolean} [waterfall]
+	 * @property {number} [index]
 	 */
 
 	/** @type {PhotoCardProps} */
-	let { photo, onUpgradeQuality, borderLess = false, waterfall = false } = $props();
+	let { photo, onUpgradeQuality, borderLess = false, waterfall = false, index = 0 } = $props();
 
 	// 使用 $derived 确保响应式更新
 	let previewSrc = $derived(`/api/v1/photo/${photo.id}/preview`);
@@ -18,10 +19,13 @@
 	// 根据原始宽高比计算瀑布流显示比例，防止图片加载前容器塌陷
 	let aspectRatioStyle = $derived(
 		waterfall && photo.width && photo.height
-			? `aspect-ratio: ${photo.width} / ${photo.height};`
+			? `${photo.width} / ${photo.height}`
 			: ''
 	);
 
+	// 砖块模式：交错延迟（按网格行顺序）；瀑布模式：同时入场（避免列填充顺序与延迟不匹配）
+	let animationDelay = $derived(waterfall ? '0ms' : `${Math.min(index, 20) * 35}ms`);
+
 	function handleMouseEnter() {
 		if (onUpgradeQuality) {
 			onUpgradeQuality(photo.id, previewSrc);
@@ -35,8 +39,8 @@
 	}
 </script>
 
-<a href={resolve(`/photo/${photo.id}`)} class="photo-card" class:photo-card-waterfall={waterfall} class:photo-card-compact-waterfall={borderLess && waterfall}>
-	<div class="photo-wrapper" class:photo-borderless={borderLess} class:photo-waterfall={waterfall} style={aspectRatioStyle}>
+<a href={resolve(`/photo/${photo.id}`)} class="photo-card" class:photo-card-waterfall={waterfall} class:photo-card-compact-waterfall={borderLess && waterfall} style={`--wf-aspect: ${aspectRatioStyle}; --wf-delay: ${animationDelay};`}>
+	<div class="photo-wrapper" class:photo-borderless={borderLess} class:photo-waterfall={waterfall}>
 		{#if photo.mimeType?.startsWith('video/')}
 			<div class="video-indicator">🎬</div>
 			<div class="photo-placeholder">
@@ -65,6 +69,19 @@
         display: block;
         text-decoration: none;
         color: inherit;
+		animation: card-enter 0.35s cubic-bezier(0.4, 0, 0.2, 1) both;
+		animation-delay: var(--wf-delay, 0ms);
+    }
+
+	@keyframes card-enter {
+		from {
+			opacity: 0;
+			transform: translateY(12px) scale(0.96);
+		}
+		to {
+			opacity: 1;
+			transform: translateY(0) scale(1);
+		}
 	}
 
 	/* 瀑布流模式：防止卡片被列截断，并添加间距 */
@@ -97,7 +114,7 @@
 
 	/* 瀑布流模式：保持原始宽高比 */
 	.photo-waterfall {
-		aspect-ratio: auto;
+		aspect-ratio: var(--wf-aspect, auto);
 		height: auto;
 	}
 
@@ -136,7 +153,6 @@
 	/* 瀑布流模式下 placeholder 默认 4:3 */
 	.photo-waterfall .photo-placeholder {
 		aspect-ratio: 4/3;
-		height: 0;
 	}
 
     .video-indicator {

web/src/lib/components/photo/PhotoGrid.svelte

@@ -40,11 +40,13 @@
 	<Empty message={m.no_photos()} icon="📷" />
 {:else}
 	<div class="photo-scroll-container" bind:this={scrollContainer}>
+		{#key waterfall + '_' + borderLess}
 			<div class="photo-grid" class:photo-grid-borderless={borderLess} class:photo-grid-waterfall={waterfall}>
-			{#each getVisiblePhotos() as photo (photo.id)}
-				<PhotoCard {photo} {onUpgradeQuality} {borderLess} {waterfall} />
+				{#each getVisiblePhotos() as photo, i (photo.id)}
+					<PhotoCard {photo} {onUpgradeQuality} {borderLess} {waterfall} index={i} />
 				{/each}
 			</div>
+		{/key}
 
 		{#if isLoading}
 			<div class="loading-trigger">