refactor: Migrate webviews from React 16 + react-bootstrap to React 19 + @vscode-elements/elements#1616

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chagong wants to merge 3 commits intomainfrom

feat/migrate-react19-vscode-elements

Commits on May 6, 2026

Migrate webviews from React 16 + react-bootstrap to React 19 + @vscode-elements/elements
chagong
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fix: derive AWT action at render time without mutating shared groups array
chagong
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Commits on May 7, 2026

fix: add fallback for --design-unit CSS variable
chagong
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