fix(core): fix layout overflow (#7647)

packages/frontend/core/src/components/blocksuite/block-suite-editor/styles.css.ts

@@ -4,6 +4,7 @@ import { style, type StyleRule } from '@vanilla-extract/css';
 export const docEditorRoot = style({
   display: 'block',
   background: cssVar('backgroundPrimaryColor'),
+  overflowX: 'clip',
 });
 
 export const affineDocViewport = style({