The relay refuses an open channel whose name another listed channel in
the community has, with `invalid: an open channel named "X" already
exists`.
- The create sheet showed that as `Exception: invalid: an open channel
named "X" already exists`. A new relayErrorMessage helper drops the
Exception wrapper and the NIP-01 prefix, so the sheet shows `An open
channel named "X" already exists`.
- Invite starter setup created `general` and `welcome-everyone` when it
found no open, unarchived stream with that name. An archived or forum
namesake keeps the name, so the create was refused and the invite
failed. Starter setup now reloads after that refusal, joins an open
stream with the name if one now exists, and otherwise skips that
starter instead of failing the join.
Co-authored-by: Larry <627498bd4bd1f281a16431e3c6cce3b5c25b6692798c78672298aefbf2f8f8b5@buzz.block.builderlab.xyz>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Logan Johnson <loganj@squareup.com>
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