feat: add Opus/Sonnet model selector to "Genera preventivo" page

Adds a "Modello AI" toggle (Opus default, Sonnet option) styled like the
existing Soggetto toggle. The server action validates the keyword and maps
it to the real model id; the agent receives the resolved id and uses it in
the Anthropic messages.create call. The proposals DB record stores the
actual model used.

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

src/app/admin/preventivi/actions.ts

@@ -62,7 +62,17 @@ export async function generateProposalDraft(formData: FormData) {
       .orderBy(desc(clientTranscripts.call_date));
   }
 
-  const MODEL = "claude-opus-4-8";
+  const MODEL_IDS = {
+    opus: "claude-opus-4-8",
+    sonnet: "claude-sonnet-4-6",
+  } as const;
+
+  const modelKey = (() => {
+    const raw = formData.get("model");
+    if (raw === "opus" || raw === "sonnet") return raw;
+    return "opus" as const;
+  })();
+  const resolvedModel = MODEL_IDS[modelKey];
 
   // Chiama agente AI
   const { content: aiContent } = await generateProposalContent({
@@ -70,6 +80,7 @@ export async function generateProposalDraft(formData: FormData) {
     client,
     transcripts,
     offer,
+    model: resolvedModel,
   });
 
   // Assembla contenuto completo
@@ -78,7 +89,7 @@ export async function generateProposalDraft(formData: FormData) {
     client,
     offer,
     aiContent,
-    model: MODEL,
+    model: resolvedModel,
   });
 
   // Salva nel DB
@@ -94,7 +105,7 @@ export async function generateProposalDraft(formData: FormData) {
     offer_macro_id: offerMacroId,
     title,
     content: assembled as unknown as Record<string, unknown>,
-    model: MODEL,
+    model: resolvedModel,
     state: "draft",
   });
 

src/app/admin/preventivi/genera/GeneraProposalForm.tsx

@@ -16,6 +16,7 @@ export function GeneraProposalForm({ leads, clients, offers, action, preselected
   const [subjectType, setSubjectType] = useState<"lead" | "client">(
     preselectedLeadId ? "lead" : "lead"
   );
+  const [model, setModel] = useState<"opus" | "sonnet">("opus");
   const [isPending, startTransition] = useTransition();
   const [error, setError] = useState<string | null>(null);
 
@@ -25,6 +26,8 @@ export function GeneraProposalForm({ leads, clients, offers, action, preselected
     const form = e.currentTarget;
     const formData = new FormData(form);
 
+    formData.append("model", model);
+
     startTransition(async () => {
       try {
         await action(formData);
@@ -65,6 +68,35 @@ export function GeneraProposalForm({ leads, clients, offers, action, preselected
         </div>
       </div>
 
+      {/* Modello AI */}
+      <div className="space-y-2">
+        <label className="text-sm font-medium text-foreground">Modello AI</label>
+        <div className="flex gap-3">
+          <button
+            type="button"
+            onClick={() => setModel("opus")}
+            className={`px-4 py-2 rounded-md text-sm border transition-colors ${
+              model === "opus"
+                ? "bg-primary text-primary-foreground border-primary"
+                : "border-border text-muted-foreground hover:border-primary/50"
+            }`}
+          >
+            Opus
+          </button>
+          <button
+            type="button"
+            onClick={() => setModel("sonnet")}
+            className={`px-4 py-2 rounded-md text-sm border transition-colors ${
+              model === "sonnet"
+                ? "bg-primary text-primary-foreground border-primary"
+                : "border-border text-muted-foreground hover:border-primary/50"
+            }`}
+          >
+            Sonnet
+          </button>
+        </div>
+      </div>
+
       {/* Select lead o cliente */}
       {subjectType === "lead" ? (
         <div className="space-y-1">
@@ -135,7 +167,7 @@ export function GeneraProposalForm({ leads, clients, offers, action, preselected
 
       {/* Info generazione */}
       <div className="text-xs text-muted-foreground bg-muted rounded-md px-3 py-2">
-        L&apos;AI (Claude Opus) legge i transcript del soggetto selezionato e genera una bozza
+        L&apos;AI (Claude {model === "opus" ? "Opus" : "Sonnet"}) legge i transcript del soggetto selezionato e genera una bozza
         personalizzata. La generazione richiede 30–60 secondi.
       </div>
 

src/lib/proposal/agent.ts

@@ -11,6 +11,7 @@ type AgentInput = {
   client?: Pick<Client, "id" | "name" | "brand_name" | "brief">;
   transcripts: Pick<ClientTranscript, "title" | "content" | "call_date">[];
   offer: OfferEditorData;
+  model?: string;
 };
 
 function buildSystemPrompt(): string {
@@ -128,7 +129,7 @@ export async function generateProposalContent(
   const client = new Anthropic({ apiKey });
 
   const message = await client.messages.create({
-    model: MODEL,
+    model: input.model ?? MODEL,
     max_tokens: 8192,
     system: buildSystemPrompt(),
     messages: [{ role: "user", content: buildUserPrompt(input) }],