026.06 Navigate to Source

Description

As an AI Agent, I want to navigate to a specific source or segment so that I can direct the researcher's attention.

Acceptance Criteria

• [ ] #1 Agent can open a specific source by ID
• [ ] #2 Agent can scroll to a specific position in a source
• [ ] #3 Agent can highlight a specific segment
• [ ] #4 Navigation is reflected in the UI immediately