Add accessibility wiring for modals

docs/qa.md

@@ -8,6 +8,7 @@ Before starting, open `docs/kitchen-sink.html` in a browser to review the modal
 * Scroll the modal content down and back up; confirm the sticky navigation bar hides on downward scroll and reappears when you reverse direction.
 * Activate the zap button to display the popover and tab through its fields to confirm focus stays within the dialog; press `Escape` to close it and ensure focus returns to the zap trigger.
 * Close the video modal first with `Escape` and again by clicking the dimmed backdrop; in both cases, focus should move back to the original trigger element you used to open the modal.
+* Repeat the accessibility spot check for the Upload, Edit, and Revert modals along with static dialogs (Login, Application form, Content appeals, Feedback, Feature request, Bug report, and Disclaimer). Ensure `Tab`/`Shift+Tab` stay within each modal and that pressing `Escape` or clicking a dismissible backdrop closes the dialog and restores focus to the opener.
 
 1. **Upload Modal Smoke Test**
    - Open the Upload modal, verify title is required, and ensure either a hosted URL or a magnet (or both) must be supplied.