pub fn default_syntax_theme() -> BTreeMap<String, String>Expand description
Builds the built-in default syntax theme: capture-name → #rrggbb.
This is the frame-host binding seat’s fallback (IRIDIUM-A2 C5,
2026-07-21 amendment), used whenever [document].syntax_theme is not
declared in frame.toml. The palette values are fixed at compile time
and always well-formed #rrggbb hex, so this function cannot fail.