Session naming: --name flag should also set the display name shown in the prompt (like /rename)

Problem

There are currently two separate ways to name a session that serve the same underlying goal — helping developers identify sessions:

1. claude -n "my-session" — sets a label visible in the /resume picker
2. /rename my-session — sets a display name shown in the terminal prompt (right-hand side with color)

These are disconnected. Using --name does not update the visible prompt name, so developers who want both behaviors (easy resume + easy identification in the terminal) have to do it twice — once via CLI flag and once manually via /rename inside the session.

Expected Behavior

claude -n "my-session" (or --name) should set both:

• The session label in the /resume picker
• The display name shown in the terminal prompt (equivalent to running /rename my-session automatically on session start)

Why

The human-level goal is identical: identify a session. Whether you're picking from a list of past sessions or glancing at multiple terminal tabs, you want the same name to appear. Splitting this into two features adds friction with no benefit.

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