feat(client): improve accessibility with ARIA labels and semantics

- Add aria-label to icon-only ActionIcon triggers across tree, comments,
  share, group, breadcrumbs, templates, AI chat, API keys, and spaces
- Give custom clickable divs/spans (color swatches, status swatches,
  load-more, PDF error, comment selection) role="button", tabIndex,
  and keyboard handlers
- Add listbox/combobox semantics (role, aria-selected, aria-activedescendant)
  to slash menu, emoji menu, mention list, and link editor results
- Add aria-haspopup/aria-expanded to bubble-menu triggers (node, text
  align, color) and status badge
- Add aria-label to Modal.Root/Dialog instances that lack a title prop
  (page history, template preview, trash preview, drawio, comment,
  find-and-replace, page verification)
- Add en-US translations for new aria-label strings

apps/client/src/ee/api-key/components/api-key-table.tsx

@@ -106,7 +106,11 @@ export function ApiKeyTable({
                 <Table.Td>
                   <Menu position="bottom-end" withinPortal>
                     <Menu.Target>
-                      <ActionIcon variant="subtle" color="gray">
+                      <ActionIcon
+                        variant="subtle"
+                        color="gray"
+                        aria-label={t("API key menu")}
+                      >
                         <IconDots size={16} />
                       </ActionIcon>
                     </Menu.Target>