feat: parse the launch selectors as a value type

--account, --thread and --message, plus the payload that crosses the socket.
A value type with no GUI dependency: it is parsed before QApplication exists
and both halves need tests no window has to be built for.

QDataStream rather than a line-based payload, because a Message-ID may contain
a newline. Every read is status-checked, which is what catches a truncated
payload: a short read otherwise leaves the fields default-constructed and a
half-written id would be applied as an empty one.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

0 files changed, 0 insertions, 0 deletions