Fix dropdown trigger accessibility state#228
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Summary
aria-haspopup="menu"andaria-expandedto the dropdown trigger elementaria-controlswhile the menu is openAccessibility impact
This addresses one concrete part of #183: screen reader users can now hear that the trigger opens a menu and whether it is currently expanded. Keyboard and screen reader users get a clearer state announcement before moving into the menu.
Validation
corepack yarn eslint src/components/dropdown-menu/DropdownMenu.tsx --report-unused-disable-directivescorepack yarn buildCloses part of #183.