fix(ssr): clear the budget timer once a raced read answers

The mood and dashboard prefetches and the sign-in location lookup raced
their work against a bare setTimeout that was never cleared, leaving
one live timer behind per render or sign-in after the work had already
answered. A shared helper races the work and clears the timer.

src/app/insights/mood/page.tsx

@@ -18,6 +18,7 @@ import {
   type MoodAggregates,
 } from "@/lib/insights/mood-aggregates";
 import type { MoodDailySeries } from "@/lib/analytics/mood-series";
+import { settleWithin } from "@/lib/async/settle-within";
 import { resolveModuleMap } from "@/lib/modules/gate";
 import { queryKeys } from "@/lib/query-keys";
 
@@ -32,12 +33,7 @@ import InsightsMoodPageClient from "./page-client";
 const PREFETCH_BUDGET_MS = 1_500;
 
 function withinBudget<T>(work: Promise<T>): Promise<T | null> {
-  return Promise.race([
-    work,
-    new Promise<null>((resolve) =>
-      setTimeout(() => resolve(null), PREFETCH_BUDGET_MS),
-    ),
-  ]).catch(() => null);
+  return settleWithin(work, PREFETCH_BUDGET_MS, null).catch(() => null);
 }
 
 /**

src/app/page.tsx

@@ -13,6 +13,7 @@ import {
   type BatchWindow,
 } from "@/lib/dashboard/batch-chart-types";
 import { resolveDashboardLayout } from "@/lib/dashboard-layout";
+import { settleWithin } from "@/lib/async/settle-within";
 import { loadDailyDigest } from "@/lib/daily/load-digest";
 import { readSeriesBatch } from "@/lib/measurements/series-batch-read";
 import { queryKeys } from "@/lib/query-keys";
@@ -30,11 +31,6 @@ import DashboardPageClient from "./page-client";
  */
 const DIGEST_SOFT_BUDGET_MS = 400;
 
-/** Resolve `undefined` after `ms` — the soft-budget loser in the digest race. */
-function softTimeout<T>(ms: number): Promise<T | undefined> {
-  return new Promise((resolve) => setTimeout(() => resolve(undefined), ms));
-}
-
 /**
  * Thin RSC wrapper around the (client) dashboard page.
  *
@@ -144,7 +140,7 @@ export default async function DashboardPage() {
           : Promise.resolve(undefined);
 
       const [digest, series] = await Promise.all([
-        Promise.race([digestWork, softTimeout(DIGEST_SOFT_BUDGET_MS)]),
+        settleWithin(digestWork, DIGEST_SOFT_BUDGET_MS, undefined),
         seriesWork,
       ]);