feat: add header and footer slots to vaadin-grid#10202

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Artur- wants to merge 11 commits intomainfrom

grid-toolbar-footer

Commits on Sep 30, 2025

feat: add header and footer slots to vaadin-grid

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refactor: remove unnecessary header-hidden and footer-hidden attributes
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test: add visual tests for grid header and footer slots

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test: update DOM snapshots for grid header and footer slots

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test: add accessibility tests for grid header and footer slots

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fix: improve keyboard navigation for grid header and footer slots

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refactor: move header and footer slots outside scroller for better Tab navigation

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test: update grid snapshots for new DOM structure

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test: update visual test baselines for header and footer slots

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fix: handle Tab navigation from grid in overlay with focus-trap

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feat: update grid min-height calculation to include header/footer slots

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