0.4.0

Release notes for 0.4.0.

Released: 2026-06-29

Features

• Palette tab — an OKLCH palette generator & checker built into the panel. A new reserved palette tab (joining color / font / spacing / size) lets a host define grouped color scales as { kind: "color", format: "oklch" } tier items (--palette-{group}-{n}) and edit/verify them in-panel with no lossy hex round-trip. Two modes:

  • Edit mode — a grouped step grid plus a PrismChart OKLCH L/C/H curve editor; dragging a curve re-derives every step in the group and commits the whole group in one batched write on pointer-up. (#390, #393, #395)

  • Check mode — a WCAG contrast-checker view over the live palette. (#394)

  • Backed by new OKLCH curve math + WCAG contrast helpers, and wired through the generic-tab apply path (buildApplyOverrides emits state.tabs[*]) so palette overrides apply, persist, and round-trip through Export/Load. (#391, #392)

Fixed

• Palette flat-mode tier ids, persist-safe hue handling, and serialize arity (post-codex-review hardening). (f9c38f9)

Other Changes

• Integration + serde + browser-confirm test coverage for the palette tab. (#396)

• Add a grouped palette tab recipe + reference docs (EN + JA). (#397)