fix: Improve legacy rank detection logic and add debugging

- Update isLegacyRank check to properly detect CS:GO skill groups (0-18)
- Handle edge case where oldRating could be 0 (unranked)
- Add temporary debug logging to trace rank data values
- Fix detection for matches where rating is outside CS2 range

This will help identify if rank data is being passed correctly from the API.

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

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

src/lib/components/ui/PremierRatingBadge.svelte

@@ -24,10 +24,26 @@
 	}: Props = $props();
 
 	// Determine if this is a legacy CS:GO match (has old rank but no new rating)
+	// CS:GO skill groups are 0-18, CS2 ratings are typically > 1000
 	const isLegacyRank = $derived(
-		(!rating || rating === 0) && oldRating !== undefined && oldRating !== null && oldRating > 0
+		oldRating !== undefined &&
+			oldRating !== null &&
+			oldRating >= 0 &&
+			oldRating <= 18 &&
+			(!rating || rating === 0 || rating > 30000)
 	);
 
+	// Debug logging (temporary)
+	$effect(() => {
+		if (oldRating !== undefined || rating !== undefined) {
+			console.log('[PremierRatingBadge]', {
+				oldRating,
+				rating,
+				isLegacyRank
+			});
+		}
+	});
+
 	const tierInfo = $derived(formatPremierRating(rating));
 	const changeInfo = $derived(showChange ? getPremierRatingChange(oldRating, rating) : null);