feat: major update with network graphs, themes, todo extensions, and more

## New Features

### Network Graph Visualization (Contacts, Calendar, Todo)
- D3.js force simulation for physics-based layout
- Zoom & pan with mouse/touchpad
- Keyboard shortcuts: +/- zoom, 0 reset, Esc deselect, / search, F focus
- Filtering by tags, company/location/project, connection strength
- Shared components in @manacore/shared-ui

### Central Tags API (mana-core-auth)
- CRUD endpoints for tags
- Schema: tags table with userId, name, color, app
- Shared tag components in @manacore/shared-ui

### Custom Themes System
- Theme editor with live preview and color picker
- Community theme gallery
- Theme sharing (public, unlisted, private)
- Backend API in mana-core-auth

### Todo App Extensions
- Glass-pill design for task input and items
- Settings page with 20+ preferences
- Task edit modal with inline editing
- Statistics page with visualizations
- PWA support with offline capabilities
- Multiple kanban boards

### Contacts App Features
- Duplicate detection
- Photo upload
- Batch operations
- Enhanced favorites page with multiple view modes
- Alphabet view improvements
- Search modal

### Help System
- @manacore/shared-help-content
- @manacore/shared-help-ui
- @manacore/shared-help-types

### Other Features
- Themes page for all apps
- Referral system frontend
- CommandBar (global search)
- Skeleton loaders
- Settings page improvements

## Bug Fixes
- Network graph simulation initialization
- Database schema TEXT for user_id columns (Better Auth compatibility)
- Various styling fixes

## Documentation
- Daily report for 2025-12-10
- CI/CD deployment guide

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/shared-help-ui/src/components/FeaturesOverview.svelte

@@ -0,0 +1,50 @@
+<script lang="ts">
+	import type { FeaturesOverviewProps } from '../types.js';
+	import FeatureCard from './FeatureCard.svelte';
+
+	let { items, translations }: FeaturesOverviewProps = $props();
+
+	const groupedItems = $derived(() => {
+		const groups: Record<string, typeof items> = {
+			'getting-started': [],
+			core: [],
+			advanced: [],
+			integration: [],
+		};
+
+		for (const item of items) {
+			const category = item.category || 'core';
+			if (groups[category]) {
+				groups[category].push(item);
+			} else {
+				groups.core.push(item);
+			}
+		}
+
+		return groups;
+	});
+
+	const hasItems = $derived(items.length > 0);
+</script>
+
+{#if !hasItems}
+	<p class="py-8 text-center text-gray-500 dark:text-gray-400">
+		{translations.features.noItems}
+	</p>
+{:else}
+	<div class="space-y-8">
+		{#each Object.entries(groupedItems()) as [_category, categoryItems]}
+			{#if categoryItems.length > 0}
+				<div class="grid gap-4 sm:grid-cols-2 lg:grid-cols-3">
+					{#each categoryItems as item (item.id)}
+						<FeatureCard
+							{item}
+							learnMoreLabel={translations.features.learnMore}
+							comingSoonLabel={translations.features.comingSoon}
+						/>
+					{/each}
+				</div>
+			{/if}
+		{/each}
+	</div>
+{/if}