The grid export button rendered white-on-white: a-button's :secondary-light
asked for bg-white-200, which tailwind never generated (no white scale in the
config), then fell through to the generic color branch that layers text-white
on top. Give the variant a real light-blue fill and stop the fallthrough, and
label the button "CSV" so it isn't a lone download glyph.
The ledger register CSV named the account but not its number, so exports had
to be joined back by name. Add an Account Number column beside it, falling
back to the bank account's numeric code.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>