Aleksey Shakhmatov b648ee904d feat(editor): Mermaid syntax highlighting, linter and autocomplete ...

- StreamLanguage tokenizer for Mermaid: diagram-type keywords, general
  keywords, directions, arrows/links, strings, %% comments, init
  directives and YAML frontmatter, with a dark-theme HighlightStyle
- live linter via mermaid.parse: maps parse errors to the right editor
  line (accounting for the frontmatter lines mermaid strips), with wavy
  underline, gutter marker and message tooltip
- autocomplete: Mermaid keyword/type/direction options plus starter
  diagram snippets offered on the first line; bracket closing
- dark-themed completion + diagnostic tooltips

Adds @codemirror/lint, @codemirror/autocomplete and @lezer/highlight.

2026-05-22 16:46:43 +03:00

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