fix: 移动端改为全宽左对齐并占满视口

mobile.css

@@ -1,5 +1,5 @@
 @media (max-width: 768px) {
-  body { padding: 0; overflow-x: hidden; }
+  body { display: block; width: 100%; min-height: 100vh; padding: 0; overflow-x: hidden; }
 
   #mobile-header {
     display: flex;
@@ -68,11 +68,11 @@
     white-space: nowrap;
   }
 
-  #app { display: block; padding: 0; }
+  #app { display: block; width: 100%; max-width: none; min-height: 100vh; padding: 0; }
   #panel-list, #panel-translate, #stats-panel { display: none; }
   #panel-editor {
     display: flex;
-    min-height: calc(100vh - 52px);
+    min-height: 100vh;
     border: none;
     border-radius: 0;
   }