Collapsed mobile instance controls are too small to use cleanly

[n8bar]

Summary

In collapsed mode on mobile, the active-instance row leaves the columns control too small to use reliably, and the same cramped layout makes the close affordance compete badly for space.

First seen

2026-04-06

Current impact

• The columns button is too tiny to hit reliably on phones.
• The close affordance competes for the same limited space.
• The collapsed row becomes harder to use right where screen economy matters most.

Likely direction

Use a single active-instance button in collapsed mode and reveal columns/close only after expanding that row.

Internal tracking

Matches Finding 13 in docs/FINDINGS.md.