feat: Implement Phase 4 - Application Architecture & Routing

Phase 4 establishes the core application structure with SvelteKit routing,
data loading, error handling, and state management.

## Routing & Data Loading
- Created root layout load function (+layout.ts) with app version and feature flags
- Implemented comprehensive error boundary (+error.svelte) with status-based messages
- Added page loaders for homepage, matches, players, and about routes
- Homepage loader fetches featured matches via API with error fallback
- Matches loader supports URL query parameters (map, player_id, limit)

## State Management (Svelte Stores)
- preferences.ts: User settings with localStorage persistence
  * Theme selection (cs2dark, cs2light, auto)
  * Favorite players tracking
  * Advanced stats toggle, date format preferences
- search.ts: Search state with recent searches (localStorage)
- toast.ts: Toast notification system with auto-dismiss
  * Success, error, warning, info types
  * Configurable duration and dismissibility

## UI Components
- Toast.svelte: Individual notification with Lucide icons
- ToastContainer.svelte: Fixed top-right toast display
- Integrated ToastContainer into root layout

## Fixes
- Fixed Svelte 5 deprecation warnings (removed <svelte:component> in runes mode)
- Updated homepage to use PageData from loader
- Added proper type safety across all load functions

## Testing
- Type check: 0 errors, 0 warnings
- Production build: Successful
- All Phase 4 core objectives completed

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

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

src/routes/+page.ts

@@ -0,0 +1,38 @@
+import type { PageLoad } from './$types';
+import { api } from '$lib/api';
+
+/**
+ * Homepage data loader
+ * Loads featured matches for the homepage
+ */
+export const load: PageLoad = async ({ parent }) => {
+	// Wait for parent layout data
+	await parent();
+
+	try {
+		// Load featured matches (limit to 6 for homepage)
+		const matchesData = await api.matches.getMatches({ limit: 6 });
+
+		return {
+			featuredMatches: matchesData.matches,
+			meta: {
+				title: 'CS2.WTF - Statistics for CS2 Matchmaking',
+				description:
+					'Track your CS2 performance, analyze matches, and improve your game with detailed statistics and insights.'
+			}
+		};
+	} catch (error) {
+		// Log error but don't fail the page load
+		console.error('Failed to load featured matches:', error);
+
+		// Return empty data - page will show without featured matches
+		return {
+			featuredMatches: [],
+			meta: {
+				title: 'CS2.WTF - Statistics for CS2 Matchmaking',
+				description:
+					'Track your CS2 performance, analyze matches, and improve your game with detailed statistics and insights.'
+			}
+		};
+	}
+};