**Every package button led to "Dieses Paket steht nicht (mehr) zum
Verkauf".** The link was built as route() plus "?term=" + term — but both
are QUERY parameters on this route, so route() had already opened the
query string and the result was `?plan=team?term=monthly`. The package
arrived as the whole string "team?term=monthly", matched nothing in the
catalogue, and the page said so politely while giving no hint why. The
address now comes from route() in one piece with a placeholder swapped
into it, and a test asserts every checkout link on the page contains
exactly one question mark.
**The saving moved the buttons it belonged to.** It hung under the switch
and was hidden on the yearly view, so choosing a term shifted the very
control that chooses it. It sits above now and never disappears: one line,
two wordings — an offer while it is an offer, a statement once it is
taken. Same on the public sheet, where its vanishing re-centred the row.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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