feat(14-02): add LeadsSearch, rewire leads pages, surface tags in LeadDetail (CRM-08/09)

- New LeadsSearch.tsx: client-side instant filter across name/email/
  company/status/tags (mirrors CatalogSearch.tsx)
- page.tsx: fetch via getLeadsWithTags()/getLeadFieldOptions(), render
  LeadsSearch + CreateLeadModal, revalidate=0
- [id]/page.tsx: fetch getLeadsWithTags()/getLeadFieldOptions(), find
  lead by id, pass tags/tagOptions to LeadDetail
- LeadDetail.tsx: add OptionMultiSelect for lead tags in the "Profilo"
  card, wired to addLeadTag/removeLeadTag/renameLeadTag with error display

src/app/admin/leads/LeadsSearch.tsx

@@ -0,0 +1,46 @@
+"use client";
+
+import { useState, useMemo } from "react";
+import { Input } from "@/components/ui/input";
+import { Search } from "lucide-react";
+import { LeadTable } from "@/components/admin/leads/LeadTable";
+import type { LeadWithTags, LeadFieldOptions } from "@/lib/admin-queries";
+
+export function LeadsSearch({
+  leads,
+  options,
+}: {
+  leads: LeadWithTags[];
+  options: LeadFieldOptions;
+}) {
+  const [query, setQuery] = useState("");
+
+  const filtered = useMemo(() => {
+    const q = query.trim().toLowerCase();
+    if (!q) return leads;
+    return leads.filter((l) => {
+      if (l.name.toLowerCase().includes(q)) return true;
+      if (l.email?.toLowerCase().includes(q)) return true;
+      if (l.company?.toLowerCase().includes(q)) return true;
+      if (l.status.toLowerCase().includes(q)) return true;
+      if (l.tags.some((t) => t.toLowerCase().includes(q))) return true;
+      return false;
+    });
+  }, [leads, query]);
+
+  return (
+    <div className="space-y-4">
+      <div className="relative max-w-sm">
+        <Search className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 text-[#71717a]" />
+        <Input
+          type="text"
+          placeholder="Cerca lead..."
+          value={query}
+          onChange={(e) => setQuery(e.target.value)}
+          className="pl-9 h-9"
+        />
+      </div>
+      <LeadTable leads={filtered} options={options} />
+    </div>
+  );
+}