Phase 3: Split utils.ts by responsibility

src/lib/game/utils/formatting.ts

@@ -1,8 +1,5 @@
-// ─── Number Formatting Functions ────────────────────────────────────────────────
+// ─── Formatting Functions ─────────────────────────────────────────────────────
 
-/**
- * Format a number with K, M, B suffixes for large numbers
- */
 export function fmt(n: number): string {
   if (!isFinite(n) || isNaN(n)) return '0';
   if (n >= 1e9) return (n / 1e9).toFixed(2) + 'B';
@@ -11,9 +8,6 @@ export function fmt(n: number): string {
   return Math.floor(n).toString();
 }
 
-/**
- * Format a number with a fixed number of decimal places
- */
 export function fmtDec(n: number, d: number = 1): string {
   return isFinite(n) ? n.toFixed(d) : '0';
 }