Preview a draft capture beat screen look.

Depth tuning deltas over a preset (M-003): cursor/camera/tilt numbers, each clamped to the preset bounds when read, the stage's look (S3b: a device frame, the background's colours and motion — a project's brand, and how much room is around the app, how round its window's corners are and how deep its shadow falls) and the cursor's look (S3c: arrow, hand or auto, its size, colour, shadow, click bounce and sparks, motion blur) and the tap mark's timing on a phone (BL-1223: how early it appears before a press, how long it holds and fades, and how far its lift's ring grows); stored as deltas only. A preset's look (its device frame, its background and its cursor) stays when a beat plays calmer: a beat moved to a gentler preset so its words stay readable, the still version it is checked against, and the quicker version made when the full one cannot be rendered all keep the look that was asked for and lose only motion (the camera and the tilt). Only reading outranks the look: when the app's words would render smaller than the preset's smallest readable size, the margins shrink first, then the device frame is left off.

When the draft's motion reads too fast (BL-1463): the one bounded value that slows it to a comfortable pace, re-planned and re-read. overrides is the beat's whole tuning with that value written in — send it as the set's overrides (preset unchanged) to apply it in one call. Null when nothing moves too fast, or no single value fixes it.

What saving the look costs and changes: always free (a capture composite is never billed).