feat: news crop editor — natural drag, zoom slider, force-dynamic page

- Rewrite crop preview: drag moves image naturally (inverted focal)
- Add zoom slider (1x-3x) + mouse wheel zoom
- Apply imageZoom on user side (featured, compact, modal)
- Force-dynamic on main page to prevent stale cache

src/app/page.tsx

@@ -13,6 +13,8 @@ import { FloatingContact } from "@/components/ui/FloatingContact";
 import { Header } from "@/components/layout/Header";
 import { Footer } from "@/components/layout/Footer";
 import { getContent } from "@/lib/content";
+
+export const dynamic = "force-dynamic";
 import { OpenDay } from "@/components/sections/OpenDay";
 import { getActiveOpenDay } from "@/lib/openDay";
 import { getAllMcRegistrations } from "@/lib/db";