Should we default to cairo_pdf where available?

[grantmcdermott]

Inspired by @kjhealy's amusing post here: https://kieranhealy.org/blog/archives/2025/02/06/kerning-and-kerning-in-a-widening-gyre/

Should be easy enough to add some kind of if (capabilities("cairo")) logic to R/setup_device.R and add an appropriate switch argument. C.f.

tinyplot/R/setup_device.R

Lines 17 to 24 in 002bee2

	if (exttype == "jpg") exttype = "jpeg"
	switch(exttype,
	png = png(filepath, width = filewidth, height = fileheight, units = "in", res = fileres),
	jpeg = jpeg(filepath, width = filewidth, height = fileheight, units = "in", res = fileres),
	pdf = pdf(filepath, width = filewidth, height = fileheight),
	svg = svg(filepath, width = filewidth, height = fileheight),
	stop("\nUnsupported file extension. Only '.png', '.jpg', '.pdf', or '.svg' are allowed.\n")
	)

[grantmcdermott]

(Aside: it would be cool if we could support some kind of repel / spread functionality in type_text().)