feat(shared-auth-ui): redesign login page with animations and theme support

- Migrate icons from custom implementation to @manacore/shared-icons (phosphor-svelte)
- Add CSS media queries for dark/light mode (no more flash on reload)
- Add subtle entrance animations (logo fadeInScale, form fadeInUp, slider fadeIn)
- Redesign custom checkbox with CSS-only styling
- Remove isDark prop dependency, use prefers-color-scheme instead
- Update auth layout to allow full-page rendering

Also updates AppSlider component:
- Add staggered entrance animations for app cards
- Redesign modal with glassmorphism style
- Add theme-aware styling via CSS media queries
- Improve status badge design in modal
- Add close button in top-right corner

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

packages/shared-auth-ui/src/components/Icon.svelte

@@ -1,30 +0,0 @@
-<script lang="ts">
-	import { iconPaths, type IconName } from '../icons/iconPaths';
-
-	interface Props {
-		name: IconName;
-		size?: number;
-		class?: string;
-		color?: string;
-	}
-
-	let { name, size = 24, class: className = '', color }: Props = $props();
-
-	const path = $derived(iconPaths[name]);
-</script>
-
-{#if path}
-	<svg
-		xmlns="http://www.w3.org/2000/svg"
-		width={size}
-		height={size}
-		fill={color || 'currentColor'}
-		viewBox="0 0 256 256"
-		class={className}
-		aria-hidden="true"
-	>
-		{@html path}
-	</svg>
-{:else}
-	<span class="text-red-500" title="Icon '{name}' not found">⚠</span>
-{/if}