feat: fullscreen button in nav panel for web and rdp services

universal-runtime/entrypoint.sh

@@ -60,6 +60,7 @@ cat > /opt/portal/index.html <<'HTML'
   <div class="nav-panel">
     <button class="nav-btn" id="btn-back" type="button" title="Назад">←</button>
     <button class="nav-btn" id="btn-home" type="button" title="Главная">⌂</button>
+    <button class="nav-btn" id="btn-fs" type="button" title="На весь экран">⛶</button>
   </div>
   <script type="module">
     import RFB from './core/rfb.js';
@@ -253,6 +254,14 @@ cat > /opt/portal/index.html <<'HTML'
 
     document.getElementById('btn-back').addEventListener('click', () => chord(XK_ALT_L, XK_LEFT, 'AltLeft', 'ArrowLeft'));
     document.getElementById('btn-home').addEventListener('click', goHome);
+    document.getElementById('btn-fs').addEventListener('click', () => {
+      if (!document.fullscreenElement) document.documentElement.requestFullscreen();
+      else document.exitFullscreen();
+    });
+    document.addEventListener('fullscreenchange', () => {
+      document.getElementById('btn-fs').textContent = document.fullscreenElement ? '✕' : '⛶';
+      document.getElementById('btn-fs').title = document.fullscreenElement ? 'Выйти из полного экрана' : 'На весь экран';
+    });
     document.addEventListener('contextmenu', (e) => e.preventDefault());
 
     (function(){