The floating group's title strip used the same id as its Area's own
background widget, and the Area was shifted back into the window while
the group's rect kept moving, so the two no longer overlapped and egui
painted "Double use of widget ID" over the panel. The strip has its own
id and the group is drawn where its rect says.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Preserve legacy selection repair, modifier routing, viewer lifecycle and workspace persistence through the shared docking integration. Qualify the complete workspace gate by refreshing the 18 stale Audio Spectrum hashes for the existing linear renderer, with an independent synthetic-tone regression.
