feat(docker-watcher): phase 14 - frontend polish & modern UI

Design system with CSS custom properties (light/dark themes).
38 Lucide SVG icon components. Dark mode with system preference.
EN/RU localization with i18n store. Skeleton loaders, empty states,
toggle switches, micro-interactions. Responsive sidebar with
mobile hamburger menu. All pages polished with consistent styling.

web/src/lib/components/SkeletonTable.svelte

@@ -0,0 +1,30 @@
+<!--
+  Task 8: Skeleton table placeholder for list views during loading.
+-->
+<script lang="ts">
+	import Skeleton from './Skeleton.svelte';
+
+	interface Props {
+		rows?: number;
+		cols?: number;
+	}
+
+	const { rows = 5, cols = 4 }: Props = $props();
+</script>
+
+<div class="overflow-hidden rounded-xl border border-[var(--border-primary)] bg-[var(--surface-card)] shadow-[var(--shadow-sm)]">
+	<div class="border-b border-[var(--border-primary)] bg-[var(--surface-card-hover)] px-6 py-3">
+		<div class="flex gap-6">
+			{#each Array(cols) as _, i}
+				<Skeleton width={i === 0 ? '6rem' : '5rem'} height="0.75rem" />
+			{/each}
+		</div>
+	</div>
+	{#each Array(rows) as _, i}
+		<div class="flex gap-6 border-b border-[var(--border-secondary)] px-6 py-4 last:border-b-0">
+			{#each Array(cols) as _, j}
+				<Skeleton width={j === 0 ? '40%' : '20%'} height="0.875rem" />
+			{/each}
+		</div>
+	{/each}
+</div>