Prevent hidden sidebar labels from stretching collapsed navigation items

Summary

Fix sidebar labels that disappear visually when collapsed but still wrap and increase the height of their icon buttons.

Requirements

• In the collapsed state, remove navigation and title labels from layout rather than only hiding them visually.
• Ensure hidden label text cannot wrap or contribute to button width or height.
• Keep collapsed sidebar icon buttons compact and consistently sized.
• Pay particular attention to the logged-out sidebar, where the issue is most noticeable.
• Preserve readable labels and the existing layout in the expanded state.
• Keep accessible names for icon-only controls when their visible labels are removed.

Acceptance criteria

• Collapsed icon buttons retain their intended compact dimensions regardless of label length.
• No invisible label text wraps or creates extra vertical space.
• The logged-out sidebar remains aligned and visually stable when collapsed.
• Expanded sidebar labels continue to display normally.
• Icon-only controls remain accessible to assistive technology.