[bubulux]

Asked by the owner while reviewing vignetting on staging: a dark vignette is hard to tell from the black stage.

What changed

Settings › Stage background (per browser, like the other Studio preferences):

• All stages: the colour behind photos on every stage, thumbnail and strip. It overrides the --photo-bg token on the page. Default is the theme's black.
• Per app: Shot, Timeline, Gallery, Plan, Metadata, Files, Rigs, Viewfinder layouts and Recycle bin can each have their own. It is set as --photo-bg on that app's windows, so it wins inside them.
• Each row has five swatches (black, near black, dark grey, mid grey, white), a colour picker, and Default. Stored values must be #rrggbb; anything else falls back to the default.
• Documented in docs/features/desktop.md (Settings).

Checked

• make check green.
• Headless Chrome: mid grey for all stages sets the page token, and white for Timeline shows around the timeline preview while other windows keep the global colour.

Not clicked through

• Every app with a custom colour, and the Sun theme. Overlay marks drawn on the stage were designed for black, so they may lose contrast on white.

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