Fix achievement badge rendering in game-stats.njk

[Copilot]

The achievement badge strip in src/_includes/game-stats.njk could remain visible on desktop even when no badges were earned because sm:flex overrode hidden. This update makes badge visibility responsive to actual badge state and aligns the badge-rendering block with the file’s existing formatting conventions.

• Badge visibility

  • Remove static sm:flex from #achievement-badges
  • Toggle sm:flex dynamically only when at least one badge is present
  • Preserve the intended behavior: hidden on mobile, visible as a flex row on larger screens when badges exist

• Render lifecycle

  • Clear the badge container before re-rendering
  • Track rendered badge count while iterating stored achievements
  • Use the rendered count as the single source of truth for container visibility

• Template consistency

  • Normalize the updated badge-rendering lines to the file’s 2-space indentation standard

badgeContainer.innerHTML = "";
var badgeCount = 0;

Object.keys(icons).forEach(function (id) {
  if (earned[id]) {
    var badge = document.createElement("span");
    badge.title = labels[id];
    badge.className = "text-sm cursor-help";
    badge.textContent = icons[id];
    badgeContainer.appendChild(badge);
    badgeCount += 1;
  }
});

badgeContainer.classList.toggle("sm:flex", badgeCount > 0);