Phi 2.1.1

Phi Browser 2.1.1 is here, a small stability release focused on Spaces, Sentinel, and a few rough edges from 2.1.0.

We fixed several Sentinel update issues, made Private Spaces behave more predictably, and tidied up layout glitches around Split View, floating sidebars, compact windows, and first-time Space switching. Safari profile imports should work more reliably now, Google Meet audio indicators should be less jumpy, and a few small UI oddities have been put back where they belong. Mostly polish. Quietly important.