perf(insights,api): always answer instantly and regenerate in the background

The insights read path served a cold cache by generating inline — up to
ten seconds on first visit — and the nightly warm pass structurally
excluded evening visitors: their visit stamped the cache, the half-four
run skipped it as fresh, and it expired exactly at the next evening's
visit. Stale content now serves immediately with its timestamp while
one background job revalidates, the warm threshold drops to an hour,
forced warming fills both message locales, the analytics caches serve
stale-while-revalidate, the profile endpoint parallelises its reads,
the bug-report status drops a write per call, the umami proxy degrades
to a no-op script instead of an error, the insights route sheds its
heaviest static imports, and the medication page prefetches on intent.

src/app/api/analytics/route.ts

@@ -3,7 +3,7 @@ import { apiHandler, requireAuth } from "@/lib/api-handler";
 import { annotate } from "@/lib/logging/context";
 import { apiSuccess } from "@/lib/api-response";
 import { NO_STORE_BUT_BFCACHE } from "@/lib/http/cache-headers";
-import { cached, caches, type ServerCache } from "@/lib/cache/server-cache";
+import { cachedSwr, caches, type ServerCache } from "@/lib/cache/server-cache";
 import { summarize, type DataPoint } from "@/lib/analytics/trends";
 import { computeSummariesSlice } from "@/lib/analytics/summaries-slice";
 import { getBpTargets } from "@/lib/analytics/bp-targets";
@@ -55,7 +55,11 @@ export const GET = apiHandler(async (request?: Request) => {
     // (userId, slice). The slim slice is the dashboard tile strip's hot
     // path; multiple dashboard mounts inside a 60-second TTL all hit a
     // warm cache.
-    const slim = await cached(
+    // v1.16.7 — SWR read: a sync-write marks the cell stale, and the
+    // tile strip's next mount should repaint from the prior summaries
+    // instantly while one background recompute refreshes them, instead
+    // of paying the 2-SQL-pass rebuild inline.
+    const slim = await cachedSwr(
       caches.analytics as ServerCache<Awaited<ReturnType<typeof computeSummariesSlice>>>,
       `${user.id}|summaries`,
       () => computeSummariesSlice(user.id),
@@ -74,7 +78,11 @@ export const GET = apiHandler(async (request?: Request) => {
   // mount, and the Coach drawer all hit this endpoint within seconds
   // of each other; the 60s TTL converts the 7.99s combined dashboard
   // wait to a Map lookup on every subsequent caller.
-  const cachedBody = await cached(
+  // v1.16.7 — SWR read, same rationale as the slim slice above: the
+  // thick body is the 30-query chain feeding the dashboard + insights
+  // hero score; after a measurement sync the next mount serves the
+  // prior body instantly while one background recompute refreshes it.
+  const cachedBody = await cachedSwr(
     caches.analytics as ServerCache<Awaited<ReturnType<typeof buildAnalyticsResponse>>>,
     `${user.id}|default`,
     () => buildAnalyticsResponse(user),