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Most modals rendered a folds Dialog/Modal with no role and no name, and their focus traps used `initialFocus: false`, so focus stayed behind the modal and a screen reader never announced it. - 32 dialogs with a visible heading: role="dialog", aria-modal, aria-labelledby → the heading (given an id), tabIndex=-1. - 4 dialogs that already had a name (Leave Room, room topic viewer, server ACL, room-nav prompt): role + aria-modal. - Their focus traps drop `initialFocus: false` for focus-trap's default (keep an already-focused autoFocus field, else the first tabbable element) with the dialog itself as fallbackFocus, so a dialog without a tabbable node can't crash the trap. Traps that live in a parent (UIA stages, Logout, Forward, Invite) get the semantics only. - The file drop overlay is deliberately left alone (not a dialog). Checked at runtime: Join with Address, Delete Message, Report Message, Leave Room and Logout open as named dialogs with focus inside and close with Escape (Tab first when a text field has focus — the shared stopPropagation keeps Escape from discarding typed text, by design). The axe e2e spec (6 tests) passes; eslint warnings unchanged (46). 17 modals with no heading (image/file viewers, loading screens) remain. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA