fix(search): type-safe programmatic dispatch of the search event

`window.DECO.events.dispatch` exists at runtime (framework bootstrap), but
@decocms/apps' ambient `Window.DECO` type (website/components/Analytics.tsx)
declares `events` with only `subscribe` — and that declaration wins the merge
over the site's globals.d.ts, so `tsc` errored:

  src/components/search/Searchbar/Form.tsx(61,27): Property 'dispatch' does not
  exist on type '{ subscribe: (fn: (event: any) => void) => void; }'.

Cast through the real runtime shape to dispatch programmatically (the search
term is dynamic, so the attribute-based useSendEvent doesn't fit here).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: JonasJesus42

src/components/search/Searchbar/Form.tsx

@@ -58,7 +58,13 @@ export default function Searchbar(
   const onSubmit = () => {
     const term = inputRef.current?.value;
     if (term) {
-      window.DECO?.events.dispatch({
+      // `dispatch` exists at runtime (set up by the framework's DECO.events
+      // bootstrap), but @decocms/apps' ambient Window.DECO type only declares
+      // `subscribe`. Cast through the real shape to dispatch programmatically.
+      const events = window.DECO?.events as unknown as
+        | { dispatch?: (event: unknown) => void }
+        | undefined;
+      events?.dispatch?.({
         name: "search",
         params: { search_term: term },
       });