[bubulux]

Follow-up to #275. Stacked on #278 (base feat/275-timeline-shot-layers); merge #278 first.

What changed

A project can make compositions mobile ready only once a shot is approved.

• Migration 0031 (additive): projects.bake_approved_only, default off.
• API: PUT /api/projects/:id takes an optional boolean bake_approved_only (absent keeps it). Every shot payload carries the project's value, so the clients need no project lookup.
• Vocab bakeWaits(shot): the setting is on and the shot is not approved.
• Studio: Library › Projects › "Phone images of compositions": Every shot / Approved shots only. The bakery skips waiting shots; the "◌" mark's tooltip says why. Toggling updates the loaded shots at once.
• Phone: a waiting step shows the photo tagged "Baked once approved" instead of "Layers not baked yet".

Decisions (owner, 2026-10-27)

• Per project, on the server.
• Existing bakes are kept, not deleted; the phone shows them while they still match. Approving a shot bakes it at the bakery's next pass.
• The phone shows the photo plus the "Baked once approved" tag.

Checked

• make check green, with new vocab and route tests (shots carry the setting, a PUT without it keeps it, non-booleans are rejected).
• Headless Chrome on a local database with 0031: the toggle saves, and shots then carry the setting.

Not clicked through

• The phone tag.
• Approving a waiting shot and watching it bake.

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