A selector in the header and the palette's Currency group pick the
currency, the primary one by default; the choice persists between pages
and $ switches it on and off. Rates come from Firefly's exchange rates,
then from the owner's own transactions with a foreign amount, walking
through other currencies when there is no direct pair. Amount converts
with a ≈ and keeps the original in its title; Money sums several
currencies into one converted amount.
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