fix: make the power menu avatar a centred circle

The widget only honours its margin. An explicit width with expand:false
collapses it to a line, and a percentage margin resolves against the whole
window rather than the padded column, which tiled the image across a 2560px
screen. So the width comes from a pixel margin derived from the content
column, and it has to equal the height the row gives the widget (220px) for
the 100% radius to draw a circle instead of an ellipse.

Also bounds the content column, which was previously full screen width: four
options spread across ~640px cells read as scattered glyphs and the selection
highlight became a slab.

Measured from screenshots rather than guessed: the avatar renders 220x220,
ratio 1.000, centred within a pixel.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01G6aeE37K4GHBsaM51yLTTq

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