fix: add loading indicators to all pages

- 'Loading…' shown in charts/fields/output areas while waiting for server response
- Console + chat: clears loading state on first output line
- Player list: table body shows loading row until refresh completes
- Player info / Server info: fields show loading until data arrives

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

js/pages/playerInfo.js

@@ -22,7 +22,7 @@ function PlayerInfoPage(params, container) {
           '<h2 class="text-center">Info</h2>' +
           '<div id="pi-notfound" class="alert alert-warning" style="display:none">This Player is currently not connected to this server!</div>' +
         '</div>' +
-        '<div id="pi-fields" class="col-sm-12"></div>' +
+        '<div id="pi-fields" class="col-sm-12"><span class="text-white-50">Loading…</span></div>' +
       '</div>' +
     '</div>';
   container.innerHTML = html;