fix(a11y): raise sub-44px tap targets to the mobile floor

Bring interactive elements that fell below the 44px iOS/WCAG touch
floor up to min-h-11 on phones (relaxing to the denser sm density on
larger screens), and add visible focus rings where they were missing:

- TimesOfDayChips remove button + API-token copy buttons gain an
  inset hit-area so the visual density stays tight while the tap
  target clears the floor.
- Dose-history row-actions menu trigger and the insights suggested-
  prompt chips raise to min-h-11 sm:min-h-9.
- Sortable table headers and the glucose advanced disclosure toggle
  gain a focus-visible ring and a phone tap floor.

src/components/data-list/sortable-head.tsx

@@ -32,7 +32,7 @@ export function SortableHead({
       <button
         type="button"
         onClick={() => onSort(column)}
-        className="hover:text-foreground inline-flex items-center gap-1 transition-colors"
+        className="hover:text-foreground focus-visible:ring-ring/50 inline-flex min-h-11 items-center gap-1 rounded-sm transition-colors focus-visible:ring-2 focus-visible:outline-none sm:min-h-0"
       >
         {label}
         {isActive ? (