fix(stml): preserve content when rows cannot fit

[benvinegar]

Summary

• stack STML row children when declared fixed widths plus minimum flex widths cannot fit
• preserve loose inline content above rows that fall back to vertical stacking
• cover both regressions with adversarial width and mixed-content tests

Testing

• bun test src/ui/lib/stml src/ui/lib/agentNoteGeometry.test.ts src/ui/fileViews/geometry.test.ts src/ui/components/ui-components.test.tsx src/ui/hooks/useTerminalReview.test.tsx — 187 passed
• bun run typecheck
• bun run lint
• bun run check:pack
• bun run test:integration — 117 passed
• bun run test:tty-smoke — 9 passed
• real-TTY source-diff smoke run

A full bun test completed 3,042 tests successfully; its only failures were the two existing website Playwright specs being discovered by Bun's test runner.

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		Aug 16, 2026 10:08pm

[greptile-apps]

Greptile Summary

This PR fixes STML row fallback behavior when declared fixed widths and minimum flex widths cannot fit.

• Detects overcommitted rows using their fixed-width and minimum flex requirements.
• Preserves loose inline content when row children stack vertically.
• Adds regression coverage for width constraints and mixed-content fallback.

Confidence Score: 5/5

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

The revised fit check prevents overcommitted horizontal allocation, while the fallback constrains stacked children to the row width and now retains loose inline content.

Important Files Changed

Filename	Overview
src/ui/lib/stml/layout.ts	Correctly detects overcommitted rows, preserves inline content during fallback, and keeps horizontal allocations within the requested width.
src/ui/lib/stml/layout.test.ts	Adds focused regression tests for fixed-width overflow and preservation of loose inline text during stacking.
.changeset/tidy-rows-stack.md	Accurately documents the patch-level STML layout fix.

_{Reviews (1): Last reviewed commit: "fix(stml): preserve content when rows ca..." | Re-trigger Greptile}