[davior]

What

Completes the Settings tab, and adds the per-scene opt-out.

New sections

• Backgrounds and fitting: background (gradient, one colour, or a GAM picture), how pictures are fitted, shortest scene.
• Default transition between scenes, beside the default camera.
• Title and chapter cards: length, slow zoom, heading and subtitle sizes for each kind.
• Quote and code panels: position, size, colours, backing.
• Watermark (a GAM picture and/or text, corner, sizes, margin, opacity) and text on every scene (fixed text, the title, or title and chapter).

Per-scene opt-out. A scene can hide the project-wide watermark, text and wave (segment.chrome). It only appears when the project draws something, and names the default (off for an intro or outro). The renderer already honoured the field.

Settings are written the same way as before: only what differs from the spec's defaults, with an emptied group removed (patchSetting). The watermark and text blocks are written in full, since a block's presence means on.

A fix to my last PR

The Output and Voice number boxes refused to start a value like 0.9 where 0 alone is out of range, so a speed could not be typed. Number boxes now keep what is typed and pass on only an in-range value (NumberField); those two sections use it, and a test types 0.9 the way a person would.

Checked

A spec carrying every field these sections write validates against the backend model, and the renderer reads each of them. Frontend: 182 passed, lint clean, npm run build typechecks. Backend: 700 passed, unchanged.

Not built

voice.provider and voice.expressivity: the renderer does not read them.

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