- Responsive presentation: `proto.settings {responsive}` (saved in the
page's prototype settings). The player resizes the presented frame to the
device's screen, or without a device to its whole area at 100%, and lays
it out again exactly as an editor resize does (constraints, auto layout,
text; an axis the frame hugs keeps hugging), live as the window, device or
file change. The player keeps its design document and lays the screen out
from it each time (`cmd::proto::respond`). In the presenter's Options menu
(Responsive beside the size options, or Responsive / Fixed size on a
device) and the Prototype panel.
- Device colours: each device model lists its colour variants
(`proto.settings {color}`), drawn in code as the body's band round black
glass; screen corners are masked exactly. Colour picker with swatches in
the Prototype panel.
- Custom size: a bare screen of any size (`proto.settings {width, height}`
picks it), W/H fields and a swap button in the Prototype panel, imported
from REST `CUSTOM` devices.
- Library collections in the Design panel's Variable modes section, under
their library's name (`library.setVariableMode`; copies whose library
isn't read stay listed).
- Flow descriptions in the presenter's flow picker (and its hover) and under
each flow in the Prototype panel.
- Tests in new modules: engine proto_responsive_tests, ui-egui
proto_responsive_tests; REST device test updated.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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