Notifications — accessibility

Keyboard

The bell is a real <button> with aria-label="Oznámení", so Tab reaches it and Enter opens the panel.
Inside the panel the tabs, Označit vše, the close button, every Zobrazit link and the footer button are all real buttons and are reachable in order.
A row is not. .nitem is a <div> with an onClick and no role and no tabindex (measured: {tag: DIV, role: null, tabindex: null}). Opening a notification from the keyboard is only possible through its Zobrazit link, and the large, obvious target is mouse-only.
The fix is the StatTile pattern: role="button", tabIndex={0}, and Enter/Space handlers on the row.

The panel is role="dialog" with aria-label="Oznámení".
The tabs are plain buttons with an active class — they are not role="tab" in a tablist, so they are announced as two buttons rather than as a filter with a selected state. Nothing exposes which one is on.
The unread dot .nitem-dot is a decorative element with no text; the read/unread state reaches assistive technology only through the class, i.e. not at all.
The lead icon is decorative and its tone is not announced.
New notifications arriving are not announced; there is no live region.

Every real button takes the foundation ring from ds.css (outline: 2px solid var(--accent); outline-offset: 1px).
The rows, having no tabindex, never show a ring.
The panel does not trap focus and does not restore focus to the bell when it closes.

Computed from packages/ui/src/tokens/tokens.css:

Row text .nitem-t in ink — 17.59:1 light, 14.53:1 dark.
.nitem-meta and the empty-state sub-line use the muted tone — 2.85:1 light, 3.63:1 dark: below AA.
Lead icon tones: --accent 4.44 / 3.83 · --positive 3.10 / 5.50 · --warning 1.80:1 light / 9.45 dark · --critical-ink well clear. The warning tone is under the non-text threshold in the light theme.
The head badge .acrm-count.accent is --accent-ink on --accent-tint — 4.58:1 light, 5.37:1 dark.

Rows are mouse-only. This is the significant gap: the primary target of the whole panel cannot be operated from the keyboard.
The filters are not exposed as tabs, so the selected filter is not announced.
Unread is conveyed by a coloured dot and a background tint alone.
Nothing announces arriving notifications, and the panel does not manage focus on open or close.