feat(Skeleton): create skeleton component and integrate it into FontVirtualList

src/shared/ui/Skeleton/Skeleton.stories.svelte

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+<script module>
+import { defineMeta } from '@storybook/addon-svelte-csf';
+import Skeleton from './Skeleton.svelte';
+
+const { Story } = defineMeta({
+    title: 'Shared/Skeleton',
+    tags: ['autodocs'],
+    parameters: {
+        docs: {
+            description: {
+                component:
+                    'Skeleton component for loading states. Displays a shimmer animation when `animate` prop is true.',
+            },
+            story: { inline: false }, // Render stories in iframe for state isolation
+        },
+    },
+    argTypes: {
+        animate: {
+            control: 'boolean',
+            description: 'Whether to show the shimmer animation',
+        },
+    },
+});
+</script>
+
+<Story
+    name="Default"
+    args={{
+        animate: true,
+    }}
+>
+    <div class="flex flex-col gap-4 p-4 w-full">
+        <div class="flex flex-col gap-2 p-4 border rounded-xl border-gray-200/50 bg-white/40">
+            <div class="flex items-center justify-between mb-4">
+                <Skeleton class="h-8 w-1/3" />
+                <Skeleton class="h-8 w-8 rounded-full" />
+            </div>
+            <Skeleton class="h-32 w-full" />
+        </div>
+    </div>
+</Story>

src/shared/ui/Skeleton/Skeleton.svelte

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+<!--
+    Component: Skeleton
+    Generic loading placeholder with shimmer animation.
+-->
+<script lang="ts">
+import { cn } from '$shared/shadcn/utils/shadcn-utils';
+import type { HTMLAttributes } from 'svelte/elements';
+
+interface Props extends HTMLAttributes<HTMLDivElement> {
+    /**
+     * Whether to show the shimmer animation
+     */
+    animate?: boolean;
+}
+
+let { class: className, animate = true, ...rest }: Props = $props();
+</script>
+
+<div
+    class={cn(
+        'rounded-md bg-gray-100/50 backdrop-blur-sm',
+        animate && 'animate-pulse',
+        className,
+    )}
+    {...rest}
+>
+</div>