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Thomas Trompette 2dcf53619f fix(front): keep kanban header columns full-width when board overflows viewport (#22926 )

## Problem

Before
<img width="1340" height="542" alt="Capture d’écran 2026-07-15 à 18 26
22"
src="https://github.com/user-attachments/assets/472dfe13-336a-43c7-8986-6cdcb04e5217"
/>

After
<img width="1340" height="542" alt="Capture d’écran 2026-07-15 à 18 26
12"
src="https://github.com/user-attachments/assets/e393a3fa-2245-42cc-b965-f16f3feaeff6"
/>

The record board (Kanban) header breaks when the screen is narrower than
the total column width. The stage header columns squish together to fit
the viewport while the cards below keep their fixed 220px width and
scroll horizontally, so the header labels no longer line up with their
columns.

Regression from #22323.

## Cause

#22323 wrapped each column header in `DragDropColumnSortableCell`. In
`fill` mode its `StyledSortableRoot` uses `min-width: 0` with the
default `flex-shrink: 1`, so the header cells collapse below their
column width when the board is wider than the viewport, instead of
overflowing into horizontal scroll like the body.

## Fix

Pin `flex-shrink: 0` in `fill` mode so header cells keep their column
width and overflow in step with the body. `fill` is board-only; the
record table header uses non-fill mode and is unaffected.

## Testing

Opportunities → "By Stage" Kanban, narrow the window below the total
column width: header stays aligned with the cards and scrolls
horizontally with them.

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2026-07-15 16:43:37 +00:00