v0.1.7

Added

• core — take twig 3.3.1, and write the highlight and the strikethrough Markdown already read (893a297)
• swift — colour a highlight from the toolbar, and everything under it that had to exist first (e685372)
• tui — the highlight's colours, under Format and in the palette — and the compound moves into core (de95804)
• web — a highlight's colour, from the editor's API to the demo's picker (f6fe368)

Behavioural changes

• leaf_core::Capabilities for a Markdown document reports
  mark: true and strike: true, where mark was false. Doc::supports and
  Doc::toggle follow: InlineKind::Mark writes ==x== and
  InlineKind::Delete writes ~~x~~ instead of setting a "not supported in
  markdown" status. A toolbar driven by the record — the TUI menu and palette,
  the web data-cap attributes, the Swift Capabilities struct — un-dims
  those two buttons with no change of its own.

• Doc::supports and Capabilities::of now answer for a
  document parsed with leaf's parse_extensions, not for twig's default
  options. Only the two flags above differ today, but a caller reading these as
  a fact about the bare format is reading them wrong: they are a fact about the
  document leaf actually builds.

• leaf_core::Capabilities gains mark_color, and
  leaf_ffi::Capabilities / leaf-wasm's CapabilitiesView gain the same field.
  Rust code constructing a Capabilities literal must add it; the two bindings
  hand out records, so a frontend only sees a new field.

• DocView gains mark_color in both bindings — a
  MarkColor? in Swift, a colour name or null in JS. A Swift host building a
  DocView or a LeafUI.EditorState by hand gets a defaulted parameter and
  compiles unchanged.

• LeafEditorModel.highlight(_:) (Swift) is now one undo step
  rather than two when it both highlights and colours a selection. A host that
  called undo() twice to reverse one press will now undo the edit before it.

• leaf_core::Doc gains highlight, and both bindings gain a
  highlight method beside set_mark_color. Nothing existing changes shape.

• EditorState (leaf-web) gains markColor and
  hasSelection. A host destructuring the state is unaffected; one comparing
  whole state objects will see them differ where they used to match.

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Every change in this release and the ones before it: docs/CHANGELOG.md.