Remove next/cache usage (use cache, cacheLife, cacheTag, cacheComponents)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01F22Ms5Cxam5UHyxaCrtZzu

app/account/page.tsx

@@ -37,8 +37,7 @@ type AccountPageProps = {
 /**
  * `/account` — core Customer Accounts surface (name + email only).
  *
- * No `export const dynamic` / `export const fetchCache`: under
- * `cacheComponents: true`, `force-dynamic` is not allowed. The page relies on
+ * No `export const dynamic` / `export const fetchCache`: the page relies on
  * the `AppShell` dynamic context (`await connection()` in the root layout's
  * shell), which opts the whole subtree into dynamic rendering — any
  * `headers()`/`cookies()` read inside (e.g. `getCustomerAccessToken()` →