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refactor(editor): migrate code editors to CodeMirror 6 - #954
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Summary
Migrate code editors and code-image rendering to CodeMirror 6, removing CodeMirror 5 dependencies. Share highlighting across editor, AI code blocks, diffs and viewers, using native CM6 language support with a TextMate fallback for remaining languages.
Restore missing token categories and embedded-language highlighting identified during comparison of all 165 supported languages. Keep focused regression tests; remove the temporary migration QA corpus.
Validation
Known limitation
Subsecond highlighting flicker has not been ruled out by frame-by-frame capture; this check is deferred.