feat: merge people search into the recipe search bar on Explore

People search existed but was buried in its own tab with no entry
point from anywhere else — easy to conclude it "doesn't work" since
nobody would find it. Now one query on Explore hits both
/api/v1/search and /api/v1/users/search and renders People/Recipes
sections together; the standalone people tab and its now-dead
PeopleSearch component are gone.

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

apps/web/app/(app)/explore/page.tsx

@@ -27,9 +27,9 @@ export type RecipeResult = {
 export default async function ExplorePage({
   searchParams,
 }: {
-  searchParams: Promise<{ q?: string; tab?: string }>;
+  searchParams: Promise<{ q?: string }>;
 }) {
-  const { q, tab } = await searchParams;
+  const { q } = await searchParams;
   const sevenDaysAgo = new Date(Date.now() - 7 * 24 * 60 * 60 * 1000);
 
   // Trending: public recipes ordered by favorite count in last 7 days
@@ -81,7 +81,6 @@ export default async function ExplorePage({
       trending={trending}
       recent={recent}
       initialQuery={q ?? ""}
-      initialTab={tab === "people" ? "people" : "recipes"}
     />
   );
 }