fix: constrain side column width (#16498)

## Before


https://github.com/user-attachments/assets/18bfd8b0-7636-40b2-aa64-24c84ab74009

## After

<img width="3456" height="2160" alt="CleanShot 2025-12-11 at 14 13
23@2x"
src="https://github.com/user-attachments/assets/e10dc51c-afdb-4145-8ed5-0aaadfebb48b"
/>

packages/twenty-front/src/modules/page-layout/components/PageLayoutLeftPanel.tsx

@@ -18,6 +18,7 @@ const StyledContainer = styled.div`
   box-sizing: border-box;
   display: grid;
   grid-template-rows: auto 1fr;
+  grid-template-columns: minmax(0, 1fr);
   height: 100%;
 `;