Sidebar and top bar now visible in estimate previews

Preview estimates while keeping the app shell visible for navigation and context.

Bug Fixes

A recent fix to the estimate preview scrolling behavior inadvertently hid the sidebar and top bar. Now they stay visible while you preview — you can navigate between estimates and phases without closing the preview.

The fix moves the preview to its own route layout group inside the app shell rather than using full-screen positioning. The sidebar, top bar, and preview panels all coexist: the document body never scrolls, but the editor and spreadsheet panels scroll independently so you have access to all content.