fix: Admin Insights actual crash — function props across server/client boundary (v0.55.3)

Server logs (thanks to the user pulling them) showed the real error:
"Functions cannot be passed directly to Client Components" — the server
component page was passing formatShortDate/formatMonth as a `formatDate`
prop into TimeSeriesChart ("use client"). Functions aren't serializable
across the RSC boundary; the two previous fixes (query hardening,
Promise.allSettled) were real improvements but not the actual cause of
the reported crash.

TimeSeriesChart now takes a plain `dateFormat: "day" | "month"` string
and formats internally — BarChart was never affected (its formatValue
prop is only ever used via its own default, never passed from the page).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

CHANGELOG.md

@@ -2,6 +2,11 @@
 
 All notable changes to Epicure are documented here. This file is mirrored in-app at `/changelog` (and in the admin dashboard) via `apps/web/lib/changelog.ts` — update both together.
 
+## 0.55.3 — 2026-07-19 19:00
+
+### Fixed
+- Admin Insights page's actual crash, found from server logs: the page (a server component) was passing plain formatter functions as props into its chart components (client components) — React can't serialize functions across that boundary. Replaced with a plain string prop ("day" vs "month") formatted inside the client component instead.
+
 ## 0.55.2 — 2026-07-19 18:20
 
 ### Fixed