feat(history): add commit lineage highlight with hover + selection#2348

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heartacker wants to merge 11 commits into

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heartacker:feat/lineage-highlight-clean

Commits on May 16, 2026

feat(Histories,Repository): add UI configuration for lineage highlighting
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perf(Histories): add viewport-aware lineage bounds for hover
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feat(Preferences): add UI configuration for hover view tracking
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perf(Histories): optimize lineage calculation with linear scan and bit array(O(V+E) -> O(N)).
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ux: refactor commit graph highlighting UI to use unified menu
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ux: expand highlighting menu with lineage search methods
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