## What’s done
- Clicking a favorite folder on mobile now opens a clean drill-down
layer with only its contents
- Added a back button (icon + folder name) — visually 100% identical to
`NavigationDrawerBackButton`
- Sidebar no longer collapses when opening a folder
- Tree line is removed on mobile (consistent with current Twenty design)
## Intentional deviations from the mockup
1. **Back button does not replace `MultiWorkspaceDropdownButton`**
Kept `NavigationDrawerHeader` untouched — it’s responsible for the
hamburger menu and workspace name.
Added the back button as a separate block below.
→ This feels cleaner architecturally and avoids breaking other places
that use `NavigationDrawerHeader`.
2. **Vertical spacing between items is slightly tighter than in the
mockup**
Used `NavigationDrawerSubItem` — the standard component for nested items
in Twenty.
Current production spacing matches this exactly, so I preferred
consistency over pixel-perfect mockup matching.
Happy to adjust either point if the team prefers to follow the mockup
1:1.
Closes#15950
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Co-authored-by: Baptiste Devessier <baptiste@devessier.fr>
Anton Ambarov
a892462c05