feat: centralized Notion-style taxonomy management in settings

Single persistent option pool per taxonomy (7 fields: offer
categoria/ticket/tipo/obiettivo + catalog fase/offerta/pacchetto),
stored as JSON in the settings table (no DB migration).

- src/lib/taxonomy.ts: pools with lazy seed from in-use values,
  add/remove(cascade)/rename helpers
- Inline creation anywhere registers into the pool (save offer,
  addServiceOption, updateServiceField fase, quickAdd, create macro)
- Deselecting on a row never touches the pool; global delete only
  from settings (cascade-strips tags / nulls columns)
- getOfferFieldOptions + getCatalogFieldOptions read from pools
- Settings: TaxonomyManager (offer + catalog groups), confirm on delete

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/components/admin/impostazioni/OfferPoolsSection.tsx

@@ -1,43 +0,0 @@
-"use client";
-
-import { PoolManager } from "./PoolManager";
-import { addPoolValue, removePoolValue } from "@/app/admin/impostazioni/actions";
-
-export function OfferPoolsSection({
-  tipoPool,
-  obiettivoPool,
-  categoriaPool,
-}: {
-  tipoPool: string[];
-  obiettivoPool: string[];
-  categoriaPool: string[];
-}) {
-  return (
-    <div className="bg-white rounded-xl border border-[#e5e7eb] p-6">
-      <h2 className="text-base font-semibold text-[#1a1a1a] mb-1">Categorie Offerta</h2>
-      <p className="text-xs text-[#71717a] mb-5">
-        Valori disponibili nei campi Tipo, Obiettivo e Categoria dell&apos;editor offerte.
-      </p>
-      <div className="flex flex-wrap gap-6">
-        <PoolManager
-          label="Tipo offerta"
-          pool={tipoPool}
-          onAdd={(v) => addPoolValue("tipo", v)}
-          onRemove={(v) => removePoolValue("tipo", v)}
-        />
-        <PoolManager
-          label="Obiettivo"
-          pool={obiettivoPool}
-          onAdd={(v) => addPoolValue("obiettivo", v)}
-          onRemove={(v) => removePoolValue("obiettivo", v)}
-        />
-        <PoolManager
-          label="Categoria"
-          pool={categoriaPool}
-          onAdd={(v) => addPoolValue("categoria", v)}
-          onRemove={(v) => removePoolValue("categoria", v)}
-        />
-      </div>
-    </div>
-  );
-}

src/components/admin/impostazioni/PoolManager.tsx

@@ -33,6 +33,10 @@ export function PoolManager({
   }
 
   function handleRemove(value: string) {
+    const ok = window.confirm(
+      `Eliminare "${value}" da «${label}»?\n\nVerrà rimosso ovunque: sparirà dal menu e da tutte le offerte/servizi che lo usano.`
+    );
+    if (!ok) return;
     startTransition(() => onRemove(value));
   }
 

src/components/admin/impostazioni/TaxonomyManager.tsx

@@ -0,0 +1,68 @@
+"use client";
+
+import { PoolManager } from "./PoolManager";
+import { addTaxonomyValue, removeTaxonomyValue } from "@/app/admin/impostazioni/actions";
+
+type FieldDef = { id: string; label: string };
+
+const OFFER_FIELDS: FieldDef[] = [
+  { id: "offer_categoria", label: "Categoria" },
+  { id: "offer_ticket", label: "Ticket" },
+  { id: "offer_tipo", label: "Tipo" },
+  { id: "offer_obiettivo", label: "Obiettivo" },
+];
+
+const CATALOG_FIELDS: FieldDef[] = [
+  { id: "service_fase", label: "Fase" },
+  { id: "service_offerta", label: "Offerta" },
+  { id: "service_pacchetto", label: "Pacchetto" },
+];
+
+function Section({
+  title,
+  subtitle,
+  fields,
+  pools,
+}: {
+  title: string;
+  subtitle: string;
+  fields: FieldDef[];
+  pools: Record<string, string[]>;
+}) {
+  return (
+    <div className="bg-white rounded-xl border border-[#e5e7eb] p-6">
+      <h2 className="text-base font-semibold text-[#1a1a1a] mb-1">{title}</h2>
+      <p className="text-xs text-[#71717a] mb-5">{subtitle}</p>
+      <div className="flex flex-wrap gap-6">
+        {fields.map((f) => (
+          <PoolManager
+            key={f.id}
+            label={f.label}
+            pool={pools[f.id] ?? []}
+            onAdd={(v) => addTaxonomyValue(f.id, v)}
+            onRemove={(v) => removeTaxonomyValue(f.id, v)}
+          />
+        ))}
+      </div>
+    </div>
+  );
+}
+
+export function TaxonomyManager({ pools }: { pools: Record<string, string[]> }) {
+  return (
+    <>
+      <Section
+        title="Tassonomie Offerte"
+        subtitle="Valori disponibili nei campi Categoria, Ticket, Tipo e Obiettivo dell'editor offerte."
+        fields={OFFER_FIELDS}
+        pools={pools}
+      />
+      <Section
+        title="Tassonomie Catalogo"
+        subtitle="Valori disponibili nei campi Fase, Offerta e Pacchetto del catalogo servizi."
+        fields={CATALOG_FIELDS}
+        pools={pools}
+      />
+    </>
+  );
+}