fix: Fix Svelte 5 reactivity issues in matches page and update API handling

- Fix toast notification imports: change from showToast to toast.success/error
- Remove hover preloading from app.html and Tabs component
- Fix match rounds API handling with safe parsing for incomplete data
- Fix pagination timestamp calculation (API returns Unix timestamp, not ISO string)
- Refactor matches page state management to fix reactivity issues:
  - Replace separate state variables with single matchesState object
  - Completely replace state object on updates to trigger reactivity
  - Fix infinite loop in intersection observer effect
  - Add keyed each blocks for proper list rendering
- Remove client-side filtering (temporarily) to isolate reactivity issues
- Add error state handling with nextPageTime in matches loader

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

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

src/routes/matches/+page.ts

@@ -41,6 +41,7 @@ export const load: PageLoad = async ({ url }) => {
 		return {
 			matches: [],
 			hasMore: false,
+			nextPageTime: undefined,
 			filters: { map, playerId },
 			meta: {
 				title: 'Browse Matches - CS2.WTF',