feat: integrate spellf() number formatting into fmt() for numbers >= 1e36

Reviewed-on: #27
Reviewed-by: Perplexity Computer <perplexity@tower.local>

game.js

@@ -685,6 +685,7 @@ function fmt(n) {
     if (n < 0) return '-' + fmt(-n);
     if (n < 1000) return Math.floor(n).toLocaleString();
     const scale = Math.floor(Math.log10(n) / 3);
+    if (scale >= 12) return spellf(n);
     if (scale >= NUMBER_ABBREVS.length) return n.toExponential(2);
     const abbrev = NUMBER_ABBREVS[scale];
     return (n / Math.pow(10, scale * 3)).toFixed(1) + abbrev;