fix: Fix match detail data loading and add API transformation layer

- Update Zod schemas to match raw API response formats
- Create transformation layer (rounds, weapons, chat) to convert raw API to structured format
- Add player name mapping in transformers for better UX
- Fix Svelte 5 reactivity issues in chat page (replace $effect with $derived)
- Fix Chart.js compatibility with Svelte 5 state proxies using JSON serialization
- Add economy advantage chart with halftime perspective flip (WIP)
- Remove stray comment from details page
- Update layout to load match data first, then pass to API methods

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

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

src/lib/api/transformers/roundsTransformer.ts

@@ -0,0 +1,60 @@
+import type { RoundsAPIResponse } from '$lib/types/api/RoundsAPIResponse';
+import type { MatchRoundsResponse, RoundDetail, RoundStats, Match } from '$lib/types';
+
+/**
+ * Transform raw rounds API response into structured format
+ * @param rawData - Raw API response
+ * @param matchId - Match ID
+ * @param match - Match data with player information
+ * @returns Structured rounds data
+ */
+export function transformRoundsResponse(
+	rawData: RoundsAPIResponse,
+	matchId: string,
+	match?: Match
+): MatchRoundsResponse {
+	const rounds: RoundDetail[] = [];
+
+	// Create player ID to team mapping
+	const playerTeamMap = new Map<string, number>();
+	if (match?.players) {
+		for (const player of match.players) {
+			playerTeamMap.set(player.id, player.team_id);
+		}
+	}
+
+	// Convert object keys to sorted round numbers
+	const roundNumbers = Object.keys(rawData)
+		.map(Number)
+		.sort((a, b) => a - b);
+
+	for (const roundNum of roundNumbers) {
+		const roundData = rawData[String(roundNum)];
+		if (!roundData) continue;
+
+		const players: RoundStats[] = [];
+
+		// Convert player data
+		for (const [playerId, [bank, equipment, spent]] of Object.entries(roundData)) {
+			players.push({
+				round: roundNum + 1, // API uses 0-indexed, we use 1-indexed
+				bank,
+				equipment,
+				spent,
+				player_id: Number(playerId)
+			});
+		}
+
+		rounds.push({
+			round: roundNum + 1,
+			winner: 0, // TODO: Determine winner from data if available
+			win_reason: '', // TODO: Determine win reason if available
+			players
+		});
+	}
+
+	return {
+		match_id: matchId,
+		rounds
+	};
+}