Mobile asked for `/targets` to carry each person's display name as the folder will
be named, so a picker can honestly say where files will appear. Right request: the
writer already computes that exact string to create a directory, and any client
computing its own would eventually disagree with it — which means telling somebody
the wrong place to look.
So `displayNameFor` is the one definition and the writer calls it too. `/targets`
gains `displayName` per person, and `myFolder` for the whole response: files land
in the RECIPIENT's tree under the SENDER's name, so that is one value rather than
a field on each row. The two are easy to confuse and the distinction matters — a
picker showing `displayName` as the destination folder would name the wrong one.
The web panel now uses both instead of its own copy of the fallback.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
