Fix rounded page layout tab edit outline (#22214)

## Summary
- Round the edited page layout tab outline to match the tab hover
radius.

## Test plan
- `npx oxfmt --check
packages/twenty-front/src/modules/page-layout/components/PageLayoutTabListReorderableTab.tsx`
- `npx oxlint --type-aware -c packages/twenty-front/.oxlintrc.json
packages/twenty-front/src/modules/page-layout/components/PageLayoutTabListReorderableTab.tsx`
- `npx nx run twenty-front:lint`
- Browser: verified the edited `Notes` tab outline before/after locally.

## Visual
<img width="1108" height="392" alt="clipboard"
src="https://github.com/user-attachments/assets/1cb63180-83a9-4ef8-9c55-2b475eaaa02b"
/>

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

@@ -16,6 +16,7 @@ type PageLayoutTabListReorderableTabProps = {
 };
 
 const StyledTabContentWrapper = styled.div<{ isBeingEdited: boolean }>`
+  border-radius: ${themeCssVariables.border.radius.sm};
   outline: ${({ isBeingEdited }) =>
     isBeingEdited ? `1px solid ${themeCssVariables.color.blue}` : 'none'};
   outline-offset: -1px;