fix(core/structure): prevent section header wrappers from collapsing in flex layouts#5203

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copilot/fix-layout-bug-flexbox

Commits on Apr 28, 2026

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Fix header-wrapper flex width regression

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marcoscaceres
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Tighten style test for header-wrapper width rule

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Agent-Logs-Url: https://github.com/speced/respec/sessions/73ac04eb-1bdc-4274-a030-3dbecbf65a24

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marcoscaceres
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