v0.91.0

What's Changed

• feat(pickers): one menu grammar for the harness and model selectors by @drewstone in #204
• fix(workspace): pin the session-panel header to h-14 so the top edge is one line by @drewstone in #205
• chore(release): publish sandbox-ui 0.91.0 by @drewstone in #206

Full Changelog: v0.90.3...v0.91.0