Working on minor bug fixing

proj-web/space-game001plain.html

@@ -68,7 +68,7 @@
             color: #fff;
             cursor: pointer;
         }
-        #nickSkip { margin-left: 8px; background: #666; }
+
     </style>
 </head>
 <body>
@@ -165,6 +165,16 @@
             loadGameScript();
         }
 
+        document.getElementById('fs-button').addEventListener('click', function() {
+            if (!document.fullscreenElement) {
+                document.documentElement.requestFullscreen().catch(function(e) {
+                    console.error('Fullscreen error: ' + e.message);
+                });
+            } else {
+                document.exitFullscreen();
+            }
+        });
+
         document.addEventListener('DOMContentLoaded', function() {
             // Готовим Module сразу — даже если откроется модалка, поле canvas будет доступно для скрипта (если он загружается позже)
             prepareModuleEnvironment();
@@ -183,14 +193,20 @@
                 // Show modal to request nickname before loading WASM
                 showNickOverlay();
                 var submit = document.getElementById('nickSubmit');
-                var skip = document.getElementById('nickSkip');
                 var input = document.getElementById('nickInput');
 
                 submit.addEventListener('click', function() {
                     saveNickAndStart(input.value);
                 });
-                skip.addEventListener('click', function() {
-                    saveNickAndStart('Player');
+
+                input.addEventListener('input', function() {
+                    // Strip any character that is not a-z, A-Z, 0-9 or space
+                    var pos = this.selectionStart;
+                    var cleaned = this.value.replace(/[^a-zA-Z0-9 ]/g, '');
+                    if (cleaned !== this.value) {
+                        this.value = cleaned;
+                        this.setSelectionRange(pos - 1, pos - 1);
+                    }
                 });
 
                 input.addEventListener('keydown', function(e) {