From fecf699bc52198f00a84114d00ccd3bbfeba741a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rapha=C3=ABl=20Bosi?=
 <71827178+bosiraphael@users.noreply.github.com>
Date: Fri, 19 Jun 2026 18:10:12 +0200
Subject: [PATCH] Fix broken CSV import grid layout (#21867)

## What

Import `react-data-grid/lib/styles.css` in `SpreadsheetImportTable`, the
single component that renders the import grid (used by the Validate Data
and Select Header steps).

## Why

The React 19 migration (#21531) bumped `react-data-grid` from
`7.0.0-beta.13` to `7.0.0-beta.59`. The old beta auto-injected its
layout CSS; beta.59 ships it as a separate
`react-data-grid/lib/styles.css` export that must be imported manually.
It was never imported, so the grid lost its base layout (grid template,
row heights, cell positioning): rows stacked at full height and columns
no longer aligned. The library scopes its styles under `@layer rdg`, so
the existing Linaria theme overrides still take precedence.

<!-- This is an auto-generated description by cubic. -->
<a
href="https://cubic.dev/pr/twentyhq/twenty/pull/21867?utm_source=github"
target="_blank" rel="noopener noreferrer"
data-no-image-dialog="true"><picture><source
media="(prefers-color-scheme: dark)"
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## Before
<img width="2540" height="1448" alt="CleanShot 2026-06-19 at 17 43
58@2x"
src="https://github.com/user-attachments/assets/a208b518-9088-4988-8245-4fdc4f8bc8de"
/>


## After
<img width="2454" height="1392" alt="CleanShot 2026-06-19 at 18 02
36@2x"
src="https://github.com/user-attachments/assets/e0b30d71-8244-4363-86aa-60b12a2dfdd9"
/>
---
 .../spreadsheet-import/components/SpreadsheetImportTable.tsx    | 1 +
 .../steps/components/ValidationStep/components/columns.tsx      | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/packages/twenty-front/src/modules/spreadsheet-import/components/SpreadsheetImportTable.tsx b/packages/twenty-front/src/modules/spreadsheet-import/components/SpreadsheetImportTable.tsx
index 81966def3d..920a3c4d9b 100644
--- a/packages/twenty-front/src/modules/spreadsheet-import/components/SpreadsheetImportTable.tsx
+++ b/packages/twenty-front/src/modules/spreadsheet-import/components/SpreadsheetImportTable.tsx
@@ -1,6 +1,7 @@
 import { styled } from '@linaria/react';
 import { useContext } from 'react';
 import { DataGrid, type DataGridProps } from 'react-data-grid';
+import 'react-data-grid/lib/styles.css';
 import { useSpreadsheetImportInternal } from '@/spreadsheet-import/hooks/useSpreadsheetImportInternal';
 import { ThemeContext, themeCssVariables } from 'twenty-ui/theme-constants';
 
diff --git a/packages/twenty-front/src/modules/spreadsheet-import/steps/components/ValidationStep/components/columns.tsx b/packages/twenty-front/src/modules/spreadsheet-import/steps/components/ValidationStep/components/columns.tsx
index b36873472b..11e0381466 100644
--- a/packages/twenty-front/src/modules/spreadsheet-import/steps/components/ValidationStep/components/columns.tsx
+++ b/packages/twenty-front/src/modules/spreadsheet-import/steps/components/ValidationStep/components/columns.tsx
@@ -56,10 +56,12 @@ const StyledInputContainer = styled.div`
 `;
 
 const StyledDefaultContainer = styled.div`
+  align-content: center;
   min-height: 100%;
   min-width: 100%;
   overflow: hidden;
   text-overflow: ellipsis;
+  white-space: nowrap;
 `;
 
 const StyledSelectReadonlyValueContianer = styled.div`