Pass speaker name instead of "User" in transcript for summary generation

[omi-discord-vector]

When generating summaries, the transcript passed to the LLM uses "User" or the speaker's initials instead of their actual name (as set in app settings).

We need to pass the speaker's configured name from their profile instead of the generic "User" label when providing the transcript for summary generation.

Steps to reproduce:

1. Set name to e.g. "Stephen" in app settings
2. Record a conversation
3. View the summary — it refers to the user as "User" or "SR" instead of "Stephen"

Expected: Summary should use the user's configured name.

Platform: Android, CV1 Omi