Add message forwarding capability

[sgrimee]

Summary

Implement the ability to forward messages from one room/conversation to another room or person.

Requirements

• Select messages to forward from current conversation
• Choose destination (existing room/person or new contact)
• Preserve message content and formatting
• Indicate forwarded messages appropriately
• Handle different message types (text, attachments, etc.)

Dependencies

• Depends on issue Add ability to discover and join existing spaces/people from server #78: "Add ability to discover and join existing spaces/people from server"
• Need destination selection capability for rooms/people not in current list
• May depend on attachment handling for forwarding messages with files

UI Considerations

• Message selection interface (single or multiple messages)
• Destination picker integrated with discovery feature
• Forward confirmation dialog
• Visual indication of forwarded messages

Implementation Notes

• Research Webex API for message forwarding endpoints
• May need to handle different forwarding behaviors (copy vs reference)
• Consider permission requirements for forwarding to different spaces
• Handle forwarding of various message types consistently

Acceptance Criteria

• Users can select messages to forward
• Destination selection works for existing and new contacts
• Messages are properly forwarded with content intact
• Forwarded messages are clearly indicated
• Error handling for failed forwards or permission issues

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