refactor(ui): extract code row layout

[benvinegar]

Summary

• extract canonical code-row width and height planning into renderer-free codeRowLayout.ts
• share add-note badge text and terminal width between geometry and painting
• make section geometry and clipboard selection import focused layout APIs instead of renderRows.tsx

Stack

• depends on refactor(ui): extract styled span layout #868

Validation

• 184 focused layout, copy-selection, and UI tests
• 132 PTY integration tests, with one platform skip
• bun run typecheck
• bun run lint
• bun run deps:check
• relevant rendering benchmarks
• independent review: PASS

The full unit wrapper reached 1,558 passing tests before the unchanged local hostRuntimeModules.test.ts resolver issue described in the repository notes.

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 1:33am

[greptile-apps]

Greptile Summary

The PR extracts code-row geometry and height planning from the renderer into a dedicated module while centralizing the add-note badge constants.

• Migrates geometry, copy-selection, rendering, and test consumers to the extracted layout API.
• Keeps rendering-specific text generation and components in renderRows.tsx.
• Adds focused coverage for the centralized badge width.

Confidence Score: 5/5

The PR appears safe to merge with no actionable regressions identified.

The extracted implementation preserves the existing planner and measurement behavior, all identified consumers were migrated, and the new dependency boundary does not introduce a runtime cycle.

Important Files Changed

Filename	Overview
src/ui/diff/codeRowLayout.ts	Extracts the existing code-row planning and measurement implementation without changing its geometry behavior or introducing a dependency cycle.
src/ui/diff/renderRows.tsx	Replaces locally defined layout helpers and badge literals with imports while retaining rendering-specific behavior.
src/ui/diff/codeRowAffordance.ts	Centralizes the fixed ASCII add-note badge text and its three-column width.
src/ui/components/panes/copySelection.ts	Updates copy-selection layout planning to import the extracted API with unchanged options.
src/ui/diff/diffSectionGeometry.ts	Migrates row-height measurement to the extracted module without changing geometry inputs.

_{Reviews (1): Last reviewed commit: "refactor(ui): extract code row layout" | Re-trigger Greptile}