feat: CodeMirror 6 side-by-side diff editor#507

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PureWeen wants to merge 9 commits intomainfrom

feat/codemirror-diff-editor

Commits on Apr 7, 2026

feat: add CodeMirror 6 merge view for syntax-highlighted diff viewing

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polish: use pre-built C# mode, add shell support, fix CSS scoping

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fix: address review — eliminate async void and Task.Delay race

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fix: address all review findings — disposal races, stale inits, inter-hunk gaps

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test: comprehensive DiffParser integration tests (39 new tests)

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perf: remove redundant DiffParser.Parse in ChatMessageItem render

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feat: add PR-style file picker to diff viewer

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feat: add split-screen PR review panel

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Commits on Apr 8, 2026

feat: polish diff review editor

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