The Activity view menu (Live/Feed/Raw) is position:fixed and portaled to
<body>, so it is anchored to the layout viewport. It was clamped using
window.visualViewport width/offset, which under pinch-zoom or an open mobile
keyboard diverges from the layout viewport and shoved the popup to the left of
the modal. Position it purely from the layout viewport
(document.documentElement.clientWidth/clientHeight) with no visual-viewport
offset so it stays under the "Activity" trigger.
Adds a regression test asserting the menu anchors under the trigger even when
the visual viewport diverges.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
69f754f868