The operator: "fit and 1:1 modes as well as moving the forward and back
arrows closer to the edge of the image ... mouse click and pan for 1:1
mode if it exceeds page width (defeat drag drop of image)". Ruled: "Fit
may enlarge."
- Fit: the picture's box is the stage's inner box, and object-fit: contain
draws it whole at the largest size that fits, up or down, never
cropped. It works with or without JS. 1:1 is natural pixels.
- The Fit | 1:1 toggle shows for every picture; the per-picture hide is
gone. It stays hidden without JS.
- The mode persists as `stage-one` on <html>, set by the head script
before the stage exists, so a 1:1 reel never paints a stage in Fit.
Anything stored but "one" reads as Fit. Storage never raises.
- The arrows sit wholly outside the DRAWN picture (near edge 8px),
clamped 8px inside the stage. They sit over the picture only when it
spans the stage, and never over the rail. They are re-placed on load,
resize, mode switch and 1:1 scroll, and keep their CSS spot until the
drawn box is known.
- 1:1 drag-to-pan when the picture overflows either axis: the picture
follows the pointer, a 4px threshold, pointer capture, grab/grabbing.
The picture is draggable=false. The stage's reveal button moves out of
the scrolled content to sit over the stage (a pan carried it off), so
no control is a pan source.
Contract docs/contracts/r2c_review_stage.contract.md (heid contract
panel 4/4 folded; it changed the no-flash mechanism). Declared test
changes: the Nyx stage-edge arrow test is replaced; the stage class and
the toggle's `hidden` are updated. tests/mutations/r2c.toml 16/16. 803
passed.
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