…essage (#1210)

fix #1029

* feat: CountDown组件读屏焦点优化

* feat: 修改count-down的aria-role

* feat: update count-dow snapshots

Co-authored-by: beedeng <beedeng@tencent.com>

* fix(tabbar): resolve safe area on round theme

* fix(tabbar): update demo

* feat(steps): using new style

* feat(steps): support css variables

* feat(steps): finish new style and update demo

* test(steps): update snapshots

* test(steps): update snapshots

* feat(button): button aria

* feat(button): button label

* test(button): update snap

* feat(button): icon hidden when content

* feat(button): icon hidden

* chore(button): update snap

* feat(calendar): add a11y support

* feat(collapse): add a11y support

* feat(calendar): add 24rpx padding for close button

* feat(fab): support aria

* chore(fab): update snap

* feat(tabs): support aria

* chore(tabs): update snap

* feat(tabs): tablist

* chore(tabs): update snap

* feat(dialog): using new style

* feat(dialog): finish new style

* feat(dialog): resolve some detail problem

* fix(dialog): remove useless css

* test(dialog): resolve bug

* feat(dialog): support css variables

* test: update snapshot

* feat(picker): using new style

* feat(date-time-picker): update demo

* test(date-time-picker): update snapshot

* docs(date-time-picker): update readme

* chore: publish 0.31.0

* chore: changelog's changes

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

* feat: tempo

* feat(popup): remove redundancy

* fix(overlay): label

* fix(popup): remove redundancy

* chore(popup): update snap

* fix(overlay): reduce tips