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/icons/IconClock.svelte

@@ -0,0 +1,7 @@
+<script lang="ts">
+	interface Props { size?: number; class?: string; }
+	const { size = 20, class: c = '' }: Props = $props();
+</script>
+<svg xmlns="http://www.w3.org/2000/svg" width={size} height={size} viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round" class={c} aria-hidden="true">
+	<circle cx="12" cy="12" r="10" /><polyline points="12 6 12 12 16 14" />
+</svg>