tabs: agent sessions share one window instead of opening one each

A session's first tab used chrome.windows.create, so every new session name (and
every Claude Code process) got its own window. It now goes into the window that
already holds any 'Pi Session:' group; a window is created only when none exists.
chrome_tab new for a session with no group also uses that window, not the user's
focused one. The primer and the chrome_tab description say so.

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