Facets: Strip text not vertically centered within allocated space

Facet strip text is not perfectly vertically centered within the allocated space (here: highlighted with a background rectangle). ``` r library(tinyplot) # dev version mtcars$vs2 = paste0(mtcars$vs, "Yy") tinyplot(wt ~ mpg, facet = ~vs2, data = mtcars, theme = "clean") ``` <!-- --> ^{Created on 2026-05-15 with [reprex v2.1.1](https://reprex.tidyverse.org)} Note how "Y" almost touches the top border while "y" has a bit more room below.