refactor(ui): unify clipboard line clipping

[benvinegar]

Problem

renderCopySelectionText duplicated visual-row clipping, terminal-cell slicing, and first/last-column handling across decorated and code-only clipboard output. The paths differed in subtle but intentional ways, making future changes error-prone.

Approach

• represent rendered clipboard rows as one CopyVisualLine shape with visual row, global origin, text, and empty-line policy;
• route headers, decorated rows, and code-only rows through one inclusive terminal-cell clipper;
• preserve split-pane origins, decorated blank lines, code-only blank omission, CJK/zero-width slicing, and terminal-control sanitization;
• add wrapped partial-line, blank-line, split-right-origin, and multi-file header coverage.

This is a behavior-preserving maintenance refactor. renderCopySelectionText complexity drops from 56 to 29.

Validation

Tested on Linux:

• bun test src/ui/components/panes/copySelection.test.ts — 51 passed;
• full test suite passed both shards before rebasing onto current main;
• bun run typecheck;
• bun run lint;
• bunx oxfmt --check src/ui/components/panes/copySelection.ts src/ui/components/panes/copySelection.test.ts;
• git diff --check main...HEAD.

No visual evidence is included because clipboard text is covered directly and interaction/rendering behavior is unchanged.

This PR description was generated by Pi using OpenAI GPT-5.6 Sol

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
hunk-web	Ignored		Aug 26, 2026 1:25pm

[greptile-apps]

Greptile Summary

This refactor represents clipboard output as uniformly clipped visual lines while preserving distinct empty-line policies for decorated and code-only output.

• Adds shared terminal-cell clipping and global-origin resolution for headers and planned diff rows.
• Expands tests for wrapped selections, blank lines, split-pane origins, and multi-file headers.
• Adds an empty changeset entry for the maintenance-only change.

Confidence Score: 5/5

The PR appears safe to merge with no actionable correctness, security, or maintainability issues identified.

The unified clipper preserves normalized selection boundaries, terminal-cell slicing, pane-relative origins, header inclusion, and the intentional difference between decorated and code-only blank lines.

Important Files Changed

Filename	Overview
src/ui/components/panes/copySelection.ts	Consolidates header, decorated-row, and code-only clipping through a shared visual-line representation without an identified behavioral regression.
src/ui/components/panes/copySelection.test.ts	Adds focused regression coverage for wrapped clipping, empty-line policy, split-right origins, and multi-file header boundaries.

_{Reviews (1): Last reviewed commit: "refactor(ui): simplify clipboard visual-..." | Re-trigger Greptile}