Project switcher for sites that configure routes.project.

Data Source

• useSolidBaseRoute()
• getSolidBaseRouteFallbackOptions(routes, "project", currentSelection)

Behavior

• omitted when fewer than two project options are available
• uses Kobalte Popover
• displays each project option's meta.label when provided, otherwise the option name
• navigates to the selected project's route root
• keeps project options visible across version gaps by falling back to a valid route selection for the target project
• supports external project values through href