feat(21-22): agente AI generazione preventivo + pagina pubblica deck

- Migration 0010: tabella proposals (id, slug, lead_id, client_id,
  offer_macro_id, content jsonb, state, selected_tier, accepted_at)
  applicata a prod via SSH tunnel
- @anthropic-ai/sdk@0.105.0 installato; ANTHROPIC_API_KEY in .env.local
- src/lib/proposal/: schema Zod ProposalContent, agente Claude Opus 4.8,
  assemble (AI + offerta DB + config consulente), queries, profile.ts
- Admin: /admin/preventivi lista + /genera (pre-fill ?lead_id=X) + /[id] review
- Sidebar: voce Preventivi + CTA globale lime "Genera preventivo"
- LeadDetail: pulsante "Genera preventivo" → /admin/preventivi/genera?lead_id=X
- Pagina pubblica /preventivo/[slug]: deck 20+ slide light-mode iamcavalli,
  navigazione frecce + dot + keyboard, accept/reject con guard immutabilità
- STATE.md aggiornato (80%), 21-PLAN.md scritto nel formato GSD

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/admin/AdminSidebar.tsx

@@ -12,16 +12,18 @@ import {
   Settings,
   LogOut,
   Zap,
+  FileText,
 } from "lucide-react";
 
 const NAV_ITEMS = [
-  { href: "/admin",              label: "Dashboard",    icon: LayoutDashboard, exact: true },
-  { href: "/admin/clients",      label: "Clienti",      icon: Users },
-  { href: "/admin/leads",        label: "Lead",         icon: Zap },
-  { href: "/admin/projects",     label: "Progetti",     icon: FolderOpen },
-  { href: "/admin/offers",       label: "Offerte",      icon: Tag },
-  { href: "/admin/catalog",      label: "Catalogo",     icon: BookOpen },
-  { href: "/admin/impostazioni", label: "Impostazioni", icon: Settings },
+  { href: "/admin",               label: "Dashboard",    icon: LayoutDashboard, exact: true },
+  { href: "/admin/clients",       label: "Clienti",      icon: Users },
+  { href: "/admin/leads",         label: "Lead",         icon: Zap },
+  { href: "/admin/projects",      label: "Progetti",     icon: FolderOpen },
+  { href: "/admin/preventivi",    label: "Preventivi",   icon: FileText },
+  { href: "/admin/offers",        label: "Offerte",      icon: Tag },
+  { href: "/admin/catalog",       label: "Catalogo",     icon: BookOpen },
+  { href: "/admin/impostazioni",  label: "Impostazioni", icon: Settings },
 ];
 
 export function AdminSidebar() {
@@ -37,6 +39,17 @@ export function AdminSidebar() {
         <span className="font-bold text-white tracking-tight text-sm">iamcavalli</span>
       </div>
 
+      {/* CTA globale — genera preventivo */}
+      <div className="px-3 py-3 border-b border-white/10">
+        <Link
+          href="/admin/preventivi/genera"
+          className="flex items-center justify-center gap-2 w-full px-3 py-2 rounded-md text-xs font-semibold bg-[#DEF168] text-[#1A463C] hover:bg-[#d4e85e] transition-colors"
+        >
+          <FileText size={13} />
+          Genera preventivo
+        </Link>
+      </div>
+
       {/* Nav links */}
       <nav className="flex-1 px-3 py-4 flex flex-col gap-0.5">
         {NAV_ITEMS.map(({ href, label, icon: Icon, exact }) => {