Feature request: multi-account profile switching for subscription accounts

Problem

Users with multiple Claude subscriptions (e.g., a personal Pro account and a company Team account) need to /logout and /login every time they want to switch between accounts. This is tedious since it requires a full OAuth browser flow each time.

Proposed solution

Support named authentication profiles that allow quick switching between accounts without re-authenticating every time. For example:

/login --profile personal
/login --profile work
/switch personal
/switch work

Or a simpler approach:

/accounts         # list authenticated accounts
/switch           # interactive picker to switch

The credentials for each profile would be stored separately in the system keychain, so switching is instant without needing to go through the browser again.

Use case

This is common for developers who have:

• A personal Pro/Max subscription
• A company Team/Enterprise subscription

Currently the only workaround is /logout + /login with a browser redirect each time.