Wiki sidebar overlaps content on small screens (< 1200px) instead of responding responsively
### Summary
When the Wiki sidebar is expanded on screens smaller than 1200px, it overlaps the main content area instead of triggering a responsive layout adjustment. The content should reflow to accommodate the expanded sidebar.
### Expected Behavior at Different Breakpoints
Desktop (1300px): ✅ Working correctly - sidebar and content visible side-by-side
{width=388 height=350}
View a Wiki page on a screen \< 1200px wide (tablet or mobile viewport)
{width=735 height=600}
* Expand the Wiki sidebar
* The sidebar overlays the content, making it difficult or impossible to read the underlying text
**Needs fixing:**
* **Tablet/Small Desktop (768px - 1199px)**: Content should shrink/reflow to accommodate the sidebar width, OR sidebar should collapse automatically
* **Mobile (\< 768px)**: Sidebar should be full-width overlay with a button to return to content
### Impact
* **Accessibility issue**: Content becomes unreadable when sidebar is open on smaller screens
* **Mobile/Tablet UX**: Makes Wiki difficult to use on these devices
### Technical Notes
* Current implementation works well at ≥ 1200px
* Need responsive behavior for breakpoints \< 1200px
issue