add ARIA labels and pressed states to board list and remaining components

src/components/boards/BoardCard.tsx

@@ -183,6 +183,7 @@ export function BoardCard({ board, sortable = false }: BoardCardProps) {
         <ContextMenuTrigger asChild>
           <button
             onClick={handleOpen}
+            aria-label={`Open board: ${board.title} - ${board.cardCount} cards, ${board.columnCount} columns, updated ${relativeTime}`}
             className="group flex w-full flex-col rounded-lg bg-pylon-surface shadow-sm transition-all duration-200 hover:-translate-y-0.5 hover:shadow-md text-left"
           >
             {/* Color accent stripe */}