#639 lands first and reads networks with decode_styled; once #631 drops the count it calls
network::decode. Needed whenever #631 is rebased onto a main that has #639.
Image filter warnings name fields of the file, so a crafted schema could add any number of
distinct warnings (each checked against all earlier ones). The mapper keeps at most as many as
the REST importer does.
The Typography section's variable picker also lists number variables for a text layer's content (shown as the number), as the engine already accepted; other text fields keep their own types (#629).
Both carry the same image filter value, which the public docs describe as green when lower and
magenta when higher; a positive native tint adds green. Both readers flip it now (the .fig path
did, the REST path didn't). The .fig test message no longer names the product.
The test schema extended the image scale-mode field that only #634 adds; it now adds the
filter containers to the paint message itself, so it works with and without #634.
Image paints that carry a current filter container now import their exposure, contrast, vibrance (as saturation), temperature, tint, highlights and shadows as native image filters. Neutral values leave the paint untouched. The older color-adjust container alone, both containers together, filters that have no native equivalent (brightness, detail, vignette and unknown fields) and malformed or non-finite values are skipped and reported as import notes. A positive tint in .fig data moves toward magenta, so it is flipped once at the .fig boundary; public REST image filters keep their sign and are not reported as approximated. Imported filters use the approximate native renderer, which the import says once.
Supported TEXT_PATH layers import as editable native text on their vector path, including mixed text styles, a start inside a later segment and reversed text direction. The importer converts the segment parameter stored in the file to the native distance along the complete path.
The mapping accepts a connected, unbranched path with one recognized start-segment marker and the default placement above the path. Damaged or unsupported path data keeps the text readable off its path and adds an import note. Other vertical placements, multiline text and ambiguous or disconnected networks are not converted. Underline and strikethrough remain a native path-rendering limitation and are reported. Public REST TEXT_PATH layers and the experimental .fig writer are unchanged.
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