Smooth thumbnail carousel navigation

Polish thumbnail carousel controls

Add crystal ball favicon

Refine test scene annotation state

Refine columns and thumbnail carousel

Add wraparound arrow navigation

Fix full-width header alignment

Right-align header split control

Anchor filmstrip and move split to header

Recover left item view layout

Add trackpad thumbnail browsing

Refine header and scene placement

Simplify viewer visual styling

Remove image metadata backdrop

Update viewer heading

Restore centered layout and thumbnail ratios

Restore eight-four viewer columns

Reorder image and question controls

Add neighboring image preview filmstrip

Reorganize viewer controls and question tools

Refine overlay layout and scene viewport

Refine image and scene object sizing

Fix desktop viewport containment

Redesign viewer desktop shell

Refine viewer layout and scene controls

Refine object marker hover states

Refine scene object interactions

Add offline interactive dataset viewer