The always-on page-info footer (`.progressinfo`) is a decorative
`role='presentation'` element, but it carried `tabIndex={-1}`, which made
it focusable. On Android, long-pressing the footer focused the div and the
WebView painted its default focus ring (`outline: auto`). Because the
element is pinned `absolute bottom-0` at book-view width, the ring rendered
as a content-column-wide line across the bottom of every page and persisted
until focus cleared.
Remove the `tabIndex` so the decorative element can no longer receive
focus. The `onClick` (tap-to-cycle progress mode / dismiss popup) still
fires regardless of tabindex, nothing focuses it programmatically, and the
translated `aria-label` keeps it exposed to screen readers unchanged.
Closes#4397
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Huang Xin
4abbc0254c