feat(pool): an admin's switch moves a user's Claude login at once
PUT /api/accounts/pins (and agenthub accounts pin) now writes a pinned Claude login into the user's home right away (claude-pool.switchHome): every home's newer pair is copied back first, the member's own login is never written over, and no pane is restarted — running sessions take the new pair at their next credentials read. A live home stays on the login it holds, so unpinning does not flip it back. The Users page calls it "Switch a user's account" and says what happened.
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