v0.51.899

What's Changed

• Release: visible-UI batch — mobile nav (#5605), mermaid mobile (#5560), steer upload scope (#5630), header font-scale (#5633), three-panel floor (#5594) by @nesquena-hermes in #5669
• fix(ux): add min-height to mermaid diagram viewport on mobile (#5525) by @nankingjing in #5560
• fix(#5545): keep center pane readable in three-panel layout by @rodboev in #5594
• fix(#5583): keep mobile nav actions visible by @rodboev in #5605
• fix(steer): scope upload UX to owner session by @ruizanthony in #5630
• fix(ui): scale model name, icon, and TPS badge with font-size preference by @nankingjing in #5633

Full Changelog: v0.51.898...v0.51.899