refactor(ui): finalize diff row facade

[benvinegar]

Summary

• rename the remaining facade to DiffRowView.tsx
• extract cursor identity and matching into cursorHighlight.ts
• migrate every consumer to focused modules instead of retaining a compatibility barrel
• update architecture documentation for the final row-rendering boundaries

Stack

• depends on refactor(ui): split mounted diff row views #877, which depends on refactor(ui): extract code cell painting #875

Validation

• full unit suite with an isolated temporary directory
• 94 focused UI/OpenTUI tests
• 132 PTY integration tests and TTY smoke
• tmux rendering validation
• 106 review-conformance tests
• 11 source-boundary tests
• bun run typecheck
• bun run lint
• bun run deps:check
• bun run build:npm
• bun run check:pack
• independent review: PASS

This PR description was generated by Pi using gpt-5.6-sol

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
hunk-web	Ignored	Preview	Aug 27, 2026 3:05am

[greptile-apps]

Greptile Summary

The PR finalizes the diff-row rendering facade without changing its rendering behavior.

• Renames renderRows.tsx to the focused DiffRowView.tsx facade and migrates its consumers.
• Extracts cursor identity and matching into cursorHighlight.ts with colocated tests.
• Updates architecture documentation to reflect the resulting row-rendering boundaries.

Confidence Score: 5/5

The PR appears safe to merge, with no concrete behavioral, build, or public-contract regressions identified.

The refactor preserves cursor matching and row-dispatch behavior, migrates all repository consumers, introduces no runtime import cycle, and keeps renamed UI internals outside published export boundaries.

Important Files Changed

Filename	Overview
src/ui/diff/DiffRowView.tsx	Renames and narrows the memoized row-dispatch facade while preserving its raw-row adaptation and rendering behavior.
src/ui/diff/cursorHighlight.ts	Extracts the unchanged cursor-highlight type and stable-key matching logic into a focused leaf module.
src/ui/diff/CodeRowView.tsx	Replaces a structurally duplicate local cursor type with the shared extracted type.
src/ui/diff/DiffSectionBody.tsx	Migrates facade and cursor-helper imports to their focused modules without changing row rendering.
src/ui/components/panes/FileView.tsx	Migrates cursor matching to the focused module while preserving extension file-view behavior.
src/opentui/HunkDiffBody.tsx	Updates the internal facade import; the renamed component does not leak through the public OpenTUI type boundary.

_{Reviews (1): Last reviewed commit: "refactor(ui): finalize diff row facade" | Re-trigger Greptile}