chore(core): use flexbox to stretch editor height (#9174)

packages/frontend/core/src/components/blocksuite/block-suite-editor/lit-adaper.tsx

@@ -281,7 +281,7 @@ export const BlocksuiteDocEditor = forwardRef<
 
   return (
     <>
-      <div className={styles.affineDocViewport} style={{ height: '100%' }}>
+      <div className={styles.affineDocViewport}>
         {!isJournal ? (
           <adapted.DocTitle doc={page} ref={onTitleRef} />
         ) : (
@@ -351,9 +351,9 @@ export const BlocksuiteEdgelessEditor = forwardRef<
   }, []);
 
   return (
-    <>
+    <div className={styles.affineEdgelessDocViewport}>
       <adapted.EdgelessEditor ref={onDocRef} doc={page} specs={specs} />
       {portals}
-    </>
+    </div>
   );
 });

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

@@ -2,15 +2,22 @@ import { cssVar } from '@toeverything/theme';
 import { style, type StyleRule } from '@vanilla-extract/css';
 
 export const docEditorRoot = style({
-  display: 'block',
   overflowX: 'clip',
+  display: 'flex',
+  flexDirection: 'column',
 });
 
 export const affineDocViewport = style({
+  height: '100%',
+  flex: 1,
   display: 'flex',
   flexDirection: 'column',
   paddingBottom: '100px',
 });
+export const affineEdgelessDocViewport = style({
+  height: '100%',
+  flex: 1,
+});
 
 export const docContainer = style({
   display: 'block',