Slice 4 step 1 (faraday-Q7). RenderShape gets a fourth member
ShapeTimeline, AllShapes extends, Validate accepts it. The
companion TimelineConfig struct stores the saved palette / density /
range-preset for a CV-timeline view so re-opening the view restores
the same visual settings — same vocabulary as the standalone
/projects/{id}/chart URL state, just persisted in user_views.render_spec
instead of the URL.
Validator mirrors the frontend's enum guards:
- known palettes (default | kind-coded | track-coded | high-contrast | print)
- known densities (compact | standard | spacious)
- known range presets (1y | 2y | all | custom)
- ISO-date strings length-bounded to 32 chars so a hostile editor
can't bloat the jsonb column.
Tests pin every accept/reject path in TestRenderSpec_TimelineConfigValidates.
Design ref: docs/design-project-chart-2026-05-09.md §11.5 + §14 Q7.
mAi
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