Phase 3: Split computed-stats.ts by responsibility

src/lib/game/utils/formatting.ts

@@ -0,0 +1,19 @@
+// ─── Number 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';
+  if (n >= 1e6) return (n / 1e6).toFixed(2) + 'M';
+  if (n >= 1e3) return (n / 1e3).toFixed(1) + 'K';
+  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';
+}