web: give Avatar a named size scale
Avatar used to take a tailwind class for its size, and a separate `tiny` flag
that picked which image size to download. Nothing kept those two in agreement,
and they drifted apart: comment avatars draw at 32px but downloaded a 32px
image, so they looked blurry on retina screens, while the small 16px avatars in
settings downloaded a full-size one.
Now there's one prop. Pick mini, small, regular or large — the names the design
system already uses — and Avatar works out the image size itself, always asking
for twice what it draws so it stays sharp. `full` is for the cases where the
surrounding layout sets the size instead; it fills whatever box you put it in
and uses the original image.
The sizes go through tv() so you can still pass your own size class and have it
win. Two size classes in one string is a coin flip otherwise, because tailwind
decides by where the rules land in the stylesheet, not the order you wrote them.
A few avatars shift slightly to land on the scale: comments 32 to 26, settings
lists 16 to 17, access and last commit 20 to 21, repo header and commit rows 24
to 26.
Signed-off-by: eti <eti@eti.tf>
alice.pds.demo.boltless.dev