fix(savings_goals/show): dedupe ring labels, DS::Button banners, status-pill contrast

- progress_ring_component: drop the in-ring "$saved / of $target" lines.
  The same money pair already renders directly below the ring in
  show.html.erb (now the single source). Inside the ring keeps only
  "Saved" + percent.
- show.html.erb: replace 3 hand-rolled button_to CTAs (Paused banner
  "Resume goal", Archived banner "Restore goal", celebration card
  "Archive goal") with DS::Button so focus/hover/disabled match the
  rest of the app. variant: primary/outline, size: sm, method: :patch.
- status_pill_component: swap text-success / text-warning / text-secondary
  to text-green-700 / text-yellow-700 / text-gray-700 so all 5 light-mode
  pill variants pass WCAG 4.5:1. Local override pending the upstream DS
  token fix tracked at we-promise/sure#1736.

app/components/savings/progress_ring_component.html.erb

@@ -13,8 +13,6 @@
     <div data-donut-chart-target="defaultContent" class="flex flex-col items-center text-center">
       <span class="text-secondary text-xs mb-1"><%= t("savings_goals.show.ring.saved") %></span>
       <span class="text-3xl font-medium tabular-nums privacy-sensitive <%= percent_text_class %>"><%= percent %>%</span>
-      <span class="text-xs text-subdued tabular-nums mt-1"><%= amount_label %></span>
-      <span class="text-xs text-subdued tabular-nums">of <%= target_label %></span>
     </div>
   </div>
 </div>