fix: guard against page-navigation race + deprecation warning

- playerInfo refresh() now early-returns if DOM elements are gone
  (happens when navigating away while getPlayers RCON is in flight)
- swiched donutLabelsOutside(false) → labelsOutside(false) to
  silence NVD3 deprecation warning

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

js/pages/serverInfo.js

@@ -93,7 +93,7 @@ function ServerInfoPage(params, container) {
       .y(function (d) { return d.y; })
       .showLabels(true)
       .donut(true)
-      .donutLabelsOutside(false)
+      .labelsOutside(false)
       .duration(500)
       .height(250)
       .color(['#a78bfa', '#7c3aed', '#e879f9', '#2d1f3d'])