Losing focus -- another tab, another window, another app -- now puts the whole page behind a blur, so an app switcher's snapshot or a glance over the shoulder gives nothing away. It comes back on focus, on the tab becoming visible again, and on the first touch or key, which lands on the veil rather than on a page nobody could see. Painted as a backdrop filter on a fixed overlay above everything the app can show: a filter on the page itself would make every fixed element position against the wrong box. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01MPZFnNdHbPGDTqQUNiE4ZN
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