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* test: add component a11y unit tests (jest-axe) Cover 14 components in two waves. 16 tests fail by design - each encodes a known gap from a11y-action-plan (phases 0-3) and flips to a regression lock once the component fix lands. 23 tests pass as regression locks for already-correct semantics. * ci: split a11y unit tests into separate workflow Main jest CI excludes *.a11y.test.* so known-gap failures don't block PRs; new a11y-unit-tests.yml runs them as informational check. * fix(a11y): resolve component gaps flagged by a11y unit tests Fixes all 16 failing jest-axe gap tests: - TableHead defaults scope=col - alert display area gets aria-live region - app header becomes <header> landmark; bell button labeled - icon wrapper decorative by default (aria-hidden), ariaLabel opt-in - Input drops wrapping <label> (name pollution) and hides placeholder span - password toggle back in tab order with aria-label/aria-pressed - CheckBoxDiv exposes checkbox role + state - accordion trigger renders native Radix button - dialogs focus container on open instead of suppressing autofocus - full-screen modal exposes dialog role/aria-modal/ariaLabel - flow list card focusable with keyboard activation Also wraps test focus calls in act() and mocks the icon loader so the a11y suite runs without React warnings. * fix: skip Puppeteer Chrome download in remaining Dockerfiles frontend and base images still ran bare npm install; puppeteer (via accessibility-checker, test-only) tried to fetch Chrome and broke the Docker image build in CI. * test: extend a11y unit test coverage (jest-axe) Adds axe + semantics tests for untested primitives (button, alert, textarea, radio-group, dropdown-menu, tooltip, popover) and two known-gap tests that fail by design until fixes land: - copyFieldAreaComponent copy action is a bare div onClick (plan 2.4) - DialogContentWithouFixed renders an empty fragment (plan 1.6) * fix: make webhook copy field a real button (a11y) Copy action was a bare div onClick - no role, name, or keyboard support (a11y-action-plan 2.4). Drops the no-longer-needed DialogContentWithouFixed known-gap test. * feat: update a11y unit tests and improve accessibility semantics in components * feat: enable pull request trigger for a11y scan workflow