The site now reads tips from the v0.3 backend, which does not hold tips
created by v0.2.x wallets, so their links said "Tip not found". A 404 from
the v0.3 backend now falls back to the legacy backend. Such tips are shown
without a claim button, with a note that claiming needs the next wallet
update, because a v0.3 wallet cannot claim them yet. Only the fields the
page renders are kept from either response.
