Fixes#23503
<img width="161" height="76" alt="Capture d’écran 2026-07-29 à 17 20
25"
src="https://github.com/user-attachments/assets/a6ea0a12-b91d-419f-8023-8e65d5dce65b"
/>
The expanded "New chat" button had a hardcoded `width: 103px`, sized for
the English label. Localized labels ("Neuer Chat", "Nouveau chat") were
clipped, since `OverflowingTextWithTooltip` can only truncate inside a
parent it cannot resize.
The expanded wrapper is now `width: max-content` with `max-width: 100%`,
so it grows with the label and only truncates (with tooltip) when the
sidebar has no space left. `min-width` keeps the pill from collapsing
below icon size. Collapsed state is unchanged.
### Verified locally (German locale)
| | wrapper width | label |
|---|---|---|
| before | 103px (fixed) | `Neuer C...` clipped |
| after | 109px (max-content) | `Neuer Chat` in full |
- English: 103px -> 98px, visually identical.
- Collapsed drawer: still exactly 24x24, unchanged.
- Very long label (Vietnamese-length): wrapper stops at the sidebar
edge, no overflow, label truncates with tooltip.
Thomas Trompette
58b8e8afee