[BUG] File tree browser mode does not update when browser width updates
Summary
Implement a simplified file tree browser panel experience for large viewports, moving away from the originally planned hover peek functionality to a more straightforward open/close panel approach.
Context
The original plan was to implement hover peek functionality for the file tree browser (similar to the super sidebar pattern). However, during design review in issue #569507, we identified UX challenges where the hover peek would hide or block the toggle button. Following design feedback, we've pivoted to implement a "boring solution" that provides better user experience and visual consistency.
Proposal
Instead of implementing hover peek, we need to adjust the current file tree browser implementation with the following changes:
- Extend current panel mode to take full viewport height
- Add close button to the file tree panel for explicit dismissal
- Improve panel positioning to avoid interfering with sidebar toggle functionality
Design
| Closed | Open |
|---|---|
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Acceptance Criteria
- File tree panel opens with full viewport height when clicked
- Close button is visible and functional within the panel
- Panel doesn't interfere with sidebar toggle functionality
- Works correctly on both intermediate and wide screen viewports
Weight
1 (reduced from 2 due to simplified scope)
Updated list of tasks within scope of this issue:
blocking In
xlviewports ≥1200px, the file tree browser is supposed to appear side-by-side with the content. In GDK, the file tree browser is currently rendering a thelgpanel at 1200px wide when it is supposed to be rendering thexlviewport view.
Ex: Issues Ex: Merge request review panel Ex: Branch rules panel This: File tree browser 
