#27933 cmux NEXT Chief: renaming a Chief saves, and Move and Scale for its picture (#27915)

Fixes https://github.com/manaflow-ai/cmux/issues/27915

Work in progress: Move and Scale is in; the rename root cause is being reproduced on a signed-in (Cloud) Chief, since a Chief of this Mac renames fine at the base.

Changelog

• Added: A picture chosen or dropped on a Chief's card opens Move and Scale; the saved circle becomes the Chief's picture.

🤖 Generated with Claude Code

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Summary by cubic

Fixes Chief renaming from the profile card so it saves (previously it could fail with "could not be changed. Try again in a moment."), and adds a Move and Scale editor for a new Chief picture.

• Choose Picture… or dropping an image on the Chief card opens a crop editor like Messages' contact photo editor: drag to move, scroll, pinch, or slide to zoom; Save keeps the circle's square.
• The saved crop is a 512px PNG written to the Chief's registry record (local files for a cloud Chief); GIFs are kept whole, as before.
• Adds debug.home.api edit_picture, a live proof script, and tours covering both the rename save and the crop.