Stabilize AMSC chart detail overlays

frontend/components/dashboard/scan-terminal/__tests__/refreshCadencePolicy.test.ts

@@ -253,6 +253,13 @@ export async function runTests() {
       chartLogicSource.includes("primeCityDetailCache"),
     "visible terminal chart detail fetches should be coalesced into one batch request and prime the shared chart cache",
   );
+  assert(
+    chartLogicSource.includes('from "@/lib/backend-api"') &&
+      chartLogicSource.includes("buildBrowserBackendHeaders") &&
+      chartLogicSource.includes('await buildBrowserBackendHeaders({ Accept: "application/json" })') &&
+      chartLogicSource.includes("headers,"),
+    "terminal chart detail batch fetches must attach the browser Supabase bearer so users without Supabase cookies do not get backend 401 and empty charts",
+  );
   assert(
     chartLogicSource.includes('scope: "chart"') &&
       chartLogicSource.includes("params.toString()"),
@@ -267,7 +274,7 @@ export async function runTests() {
       chartLogicSource.includes("missing?: string[]"),
     "frontend city detail batch payload should understand partial responses and missing city markers",
   );
-  const flushCityDetailBatchBlock = chartLogicSource.match(/async function flushCityDetailBatch[\s\S]*?\r?\n}\r?\n\r?\nfunction fetchCityDetailBatchWithTimeout/)?.[0] || "";
+  const flushCityDetailBatchBlock = chartLogicSource.match(/async function flushCityDetailBatch[\s\S]*?\r?\n}\r?\n\r?\n(?:async\s+)?function fetchCityDetailBatchWithTimeout/)?.[0] || "";
   assert(
     flushCityDetailBatchBlock.includes("partialMissingCities") &&
       flushCityDetailBatchBlock.includes("resolveBatchWaiters(waiters, null)") &&

frontend/components/dashboard/scan-terminal/temperature-chart-logic.ts

@@ -12,6 +12,7 @@ import type {
 } from "@/lib/dashboard-types";
 import { buildDebBaselinePath } from "@/lib/temperature-chart-paths";
 import { DASHBOARD_REFRESH_POLICY_MS } from "@/lib/refresh-policy";
+import { buildBrowserBackendHeaders } from "@/lib/backend-api";
 import type { CityPatch } from "@/hooks/use-sse-patches";
 const ROLLING_WINDOW_BEFORE_MS = 12 * 60 * 60 * 1000;
 const ROLLING_WINDOW_AFTER_LIVE_MS = 2 * 60 * 60 * 1000;
@@ -1715,7 +1716,7 @@ function resolveAllBatchWaitersAsNull(
   });
 }
 
-function fetchCityDetailBatchWithTimeout(
+async function fetchCityDetailBatchWithTimeout(
   cities: string[],
   resolution: string,
   forceRefresh: boolean,
@@ -1730,8 +1731,9 @@ function fetchCityDetailBatchWithTimeout(
     resolution,
     scope: "chart",
   });
+  const headers = await buildBrowserBackendHeaders({ Accept: "application/json" });
   return fetch(`/api/cities/detail-batch?${params.toString()}`, {
-    headers: { Accept: "application/json" },
+    headers,
     signal: controller.signal,
   })
     .then(async (res) => {