fix(refresh): don't call a stored copy "nothing newer", and point an entry at its feature

When the network failed behind the service worker, it answered from its
own store. Check for new data then said nothing newer was published when
the server was never reached. The worker now marks that copy, and a fresh
check treats it as unreachable; ordinary loads still use it offline.

The built-in tasks entry linked to a follow-up fix instead of the
feature, and the changelog spec's details now match what shipped.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/shared/changelog.ts

@@ -72,7 +72,7 @@ export const ENTRIES: Entry[] = [
     kind: "feature",
     title: "Built-in weekly tasks for Zenless Zone Zero and Arknights: Endfield",
     body: "Ridu Weekly (1,300 points) and the Weekly Routine (10 points), each dated by the page it comes from. You're asked once per game; Make it mine copies one into your own tasks to edit.",
-    ref: "1c7df63",
+    ref: "624c725",
     note: "weekly-and-monthly-tasks",
   },
   // 2026-10-13 — weekly and monthly tasks