- Add show_scans_public and show_guides_public columns to projects table - Add visibility toggles to editor sidebar settings panel (auto-save) - Add visibility toggles to project settings dialog (auto-save) - Propagate settings to community viewer (hide scans/guides for non-owners) - Add updateProjectVisibility server action - Fix username onboarding dialog stuck after DB reset (validate update affected rows) - Add error handling to UsernameGate for stale sessions Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>