Mobile displays a different author than Desktop for workflow messages

[ryanshepps]

Summary

• Mobile displays relay-signed workflow messages under the relay pubkey instead of the attributed workflow owner.
• This creates a second, ghost-looking identity even though the workflow owner already exists in the channel.
• Observed in below screenshot where PostHog Alerts owns the workflow but 2e69236f… authors its messages.

Reproduction

1. Create a workflow owned by a named profile.
2. Have the workflow send a channel message through the relay.
3. Open the channel in Mobile.
4. Observe the relay pubkey where the workflow owner's name and avatar should appear.

Expected behavior

Workflow messages should display the same author in Mobile as they do in Desktop.