fix: set max width for wide mode to 1280px

resources/css/common.css

@@ -4,7 +4,7 @@
   --ls-page-text-size: 1em;
   --ls-page-title-size: 36px;
   --ls-main-content-max-width: 810px;
-  --ls-main-content-max-width-wide: 100%;
+  --ls-main-content-max-width-wide: 1280px;
   --ls-font-family: Inter;
   --ls-scrollbar-width: 6px;
   --ls-border-radius-low: 4px;