Accelerate the chart range switch, prefetch two list pages, calm two polls

placeholderData keeps the previous range painted while a health-chart
range switch fetches, paired with its truth condition: the container
dims and goes inert while isPlaceholderData is true, so the old range
cannot masquerade as the new one. The mood chart needs no pairing — its
range is a client-side slice over one static-key query and never drops
to a skeleton.

/checkups and /mood gain the dashboard-template RSC prefetch: the
primary list read moves into a shared lib read (route + wrapper consume
one query, so filter/order/wire shape cannot drift), the wrapper honours
the DASHBOARD_SSR_PREFETCH kill-switch, resolves identity through
getUnswitchedSession, JSON-round-trips the dehydrated state, and fails
soft to the bare client on every error path. Page-prefetch unit tests
pin the seeded keys and the fail-soft arms; the SSR hydration spec
gains an assertion per page.

The achievement-unlock poll drops to five minutes (in-app writes already
invalidate the cell; the poll only covers out-of-band ingest), and the
plan-proposal poll gains the advisor-style bounded attempt ceiling so an
open thread stops polling after its budget.

src/components/gamification/achievement-unlock-notifier.tsx

@@ -80,7 +80,12 @@ export function AchievementUnlockNotifier({
   // to re-render on the same cadence.
   const { data } = useAchievementsQuery({
     enabled: !!user && achievementsEnabled,
-    refetchInterval: 2 * 60 * 1000,
+    // 5 min: every in-app write already invalidates the achievements cell
+    // (the `*DependentKeys` bundles all carry it), so this poll exists ONLY
+    // to surface an unlock earned by out-of-band ingest (an iOS batch, a
+    // Withings sync). A toast for those arriving up to five minutes later is
+    // an honest trade against an app-global 2-minute poll.
+    refetchInterval: 5 * 60 * 1000,
   });
 
   useEffect(() => {