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* feat(vcs): IDEA's diff algorithm and change colouring in the diff viewer Port IntelliJ's text comparison to TypeScript (src/features/vcs/comparison): Myers/patience LCS with unique-element discarding, ByLine (smart matching that skips unimportant lines, chunk optimizer, second-step correction), ByWord (word chunks, punctuation matching, whitespace policies, line block splitting) and ComparisonManager's compareLinesInner / processBlocks. The port runs IntelliJ's own LineComparisonUtilTest, WordComparisonUtilTest and SplitComparisonUtilTest cases (459 runs), converted to ideaCases.json. MergeView chunks now come straight from these line fragments, with the inner word fragments as chunk changes, instead of @codemirror/merge's presentable diff. Revert and >> / << replace lines as DiffUtil.applyModification does. Colour changes as IDEA does: modified (blue), inserted (green) and deleted (grey) by chunk type, a lighter line background for chunks whose words were compared, each word fragment in its own type at full line height, a thin bar for a fragment empty on one side, and the colours carried into the gutters and the divider bands. New --diff-modified / --diff-inserted / --diff-deleted theme tokens, imported from .icls DIFF_* attributes. Add a Playwright suite over a generated git repository of diff cases, including 10,000-line files, in every viewer mode. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * fix(vcs): preserve unified revert boundaries and bound large diffs --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> Co-authored-by: l0ng-ai <24760907+l0ng-ai@users.noreply.github.com>