Version switcher for sites that configure routes.version.

Data Source

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

Behavior

• omitted when fewer than two version options are available
• uses Kobalte Popover
• displays each version option's meta.label when provided, otherwise the option name
• navigates to the selected version's route root
• scopes available versions to the current project
• supports external version values through href