[alpharius-ck]

Motivation

FAB.Menu did not follow the Material 3 spec or the other v6 components in a few ways. On web it did not tell assistive technology whether it was open. Collapsed items stayed in the tab order and the accessibility tree. Items had no hover, focus or press feedback, and a menu taller than the screen could not scroll.

This PR fixes those. Dismissal (Escape, Android back, outside press, screen reader escape) and focus handling (focus on open, restore on close) are intentionally left out and belong to the overlay work in #5127. A follow-up will wire FAB.Menu into that portal stack. Until then, the menu closes only through its trigger and items, as on main.

Builds on #5110 (variant rename). It also covers the aria-expanded change from #5151, so one of the two should be dropped when they land.

Related issue

https://app.notion.com/p/callstack/Complete-FAB-Menu-behavior-and-web-adaptation-3ac5d027c0f8806ba4f8f5a8cc061eac?v=3285d027c0f880a68ccb000c1ce3c56e&source=copy_link

Screenshots / Videos

Test plan

Use the example app: FAB → menu (yarn example web, yarn example ios, yarn example android).

Web

1. In dev tools, the closed trigger has aria-expanded="false" and aria-haspopup="menu". After opening, it has aria-expanded="true", and the items container has role="menu".
2. With the menu closed, Tab does not stop on any item. With it open, Tab reaches the items.
3. With focus on an item, ArrowUp/ArrowDown, Home and End move focus through the items and then the close button, and wrap around. Arrow keys do nothing when focus is outside the menu.
4. Hover, keyboard-focus and press an item. The state layer and elevation change. The focus ring appears for keyboard focus only, not mouse clicks. The state resets after the menu closes.
5. Shrink the window height so the items don't fit. They scroll, the close button stays reachable, and the scroll position returns to the top each time the menu opens.

iOS / Android

1. On a short screen or in landscape (Android: adb shell wm size 1080x1000), the items scroll to the last one. Reopening starts at the top.
2. With VoiceOver or TalkBack on, collapsed items are not announced. Expanded items are announced, and the trigger is announced as expanded or collapsed.
3. Press and hold an item (touch), or hover it on iPad with a pointer. The state layer shows and clears.

[github-actions]

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