- MenuBar: mouse hover now sets the hovered row and opens submenus next
to the hovered item (previously hover state was never set from the
mouse, so '>' rows never opened their submenu)
- Menu popup: debug selectors for test automation
- viewer: transport bar renders 16px icon buttons with localized
tooltips via a host-registered icon resolver (glyph fallback kept)
- new icons.rs (theme-aware icon resolver) and tooltip.rs helpers
Mike-Solar
507d7e6e8d