feat(nav): flag Stake as NEW! in the Money dropdown (#253)

Stake shipped without a badge because which one it deserved was a call about
the campaign's status rather than something to infer from the route existing.
That call is now made: NEW!, the same literal Bounties and Swap already carry.

No i18n change — badges are literal strings on the nav item, not translated
keys, so this reads NEW! in both locales from one line.

The dropdown now shows three NEW! (Stake, Bounties, Swap) and two SOON (Rounds,
Shop). That is intentional; nothing was removed from the other two.

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: sktbrd

src/components/layout/DaoHeader.tsx

@@ -141,6 +141,7 @@ function buildNavigationItems(t: NavTranslations) {
           href: "/stake",
           icon: Coins,
           description: t("items.money.stake.description"),
+          badge: "NEW!",
         },
         {
           title: t("items.money.bounties.title"),