When sending cross-context messages via BlueBubbles, the origin marker was
exposing internal chat_guid routing info like '[from bluebubbles:chat_guid:any;-;+19257864429]'.
This adds a formatTargetDisplay() function to the BlueBubbles plugin that:
- Extracts phone numbers from chat_guid formats (iMessage;-;+1234567890 -> +1234567890)
- Normalizes handles for clean display
- Avoids returning raw chat_guid formats containing internal routing metadata
Now cross-context markers show clean identifiers like '[from +19257864429]' instead
of exposing internal routing details to recipients.
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