Prioritize _G.nvim_vimenter_done (recorded when runtime plugins and ShaDa
are fully loaded) for the startup time displayed in mini.starter's footer,
falling back to _G.nvim_init_done if unavailable. This makes the reported
duration much closer to what --startuptime measures.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>