fix: contain board canvas overflow

apps/nextjs/src/components/board/layout/scaled-board-canvas.module.css

@@ -3,6 +3,7 @@
   max-width: 100%;
   min-width: 0;
   overflow: visible;
+  overflow-x: auto;
   overscroll-behavior-inline: contain;
 }
 

apps/nextjs/src/components/layout/header.tsx

@@ -18,7 +18,7 @@ interface Props {
 
 export const MainHeader = ({ logo, actions, hasNavigation = true }: Props) => {
   return (
-    <AppShellHeader maw="100vw" zIndex={201} style={{ overflowX: "hidden" }}>
+    <AppShellHeader maw="100vw" zIndex={201} style={{ overflowX: "hidden" }} data-app-shell-header>
       <Group h="100%" gap="xl" px="md" justify="apart" wrap="nowrap">
         <Group h="100%" align="center" style={{ flex: 1 }} wrap="nowrap">
           {hasNavigation && <ClientBurger />}