Session Resume Fails to Preserve Original Session Identifier

Bug Description
When you use --resume to continue a previous session, it should:

1. Load the previous conversation context
2. Maintain the original session ID for continuity
3. Display that original session ID in the status line

But instead, it's generating a new session ID while correctly loading the old context, which can be confusing for tracking sessions.

Environment Info

• Platform: darwin
• Terminal: Apple_Terminal
• Version: 1.0.72
• Feedback ID: