feat: brand color system + Kanban view (admin + client)

- Fix button contrast: add all missing shadcn tokens (primary-foreground,
  ring, input, muted, destructive) aligned to iamcavalli brand
- NavBar: #1A463C green bar with white text
- Login page: clean brand layout with iamcavalli wordmark
- Admin pages: brand colors on headings, borders, links
- Admin ClientRow: semantic payment badges (green/yellow/red)
- Admin phases tab: Lista ↔ Kanban toggle with @dnd-kit drag & drop
  between Da fare / In corso / Fatto columns (optimistic updates)
- Client dashboard: Timeline ↔ Kanban toggle, expandable task cards
  with approve button + comment form inline

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

src/app/admin/clients/[id]/page.tsx

@@ -5,6 +5,7 @@ import { PhasesTab } from "@/components/admin/tabs/PhasesTab";
 import { PaymentsTab } from "@/components/admin/tabs/PaymentsTab";
 import { DocumentsTab } from "@/components/admin/tabs/DocumentsTab";
 import { CommentsTab } from "@/components/admin/tabs/CommentsTab";
+import { PhasesViewToggle } from "@/components/admin/kanban/PhasesViewToggle";
 import Link from "next/link";
 
 export const revalidate = 0;
@@ -51,7 +52,11 @@ export default async function ClientDetailPage({
         </TabsList>
 
         <TabsContent value="phases">
-          <PhasesTab phases={phases} clientId={client.id} />
+          <PhasesViewToggle
+            listView={<PhasesTab phases={phases} clientId={client.id} />}
+            phases={phases}
+            clientId={client.id}
+          />
         </TabsContent>
         <TabsContent value="payments">
           <PaymentsTab

src/app/admin/login/page.tsx

@@ -74,17 +74,23 @@ function AdminLoginForm() {
 
 export default function AdminLoginPage() {
   return (
-    <div className="min-h-screen flex items-center justify-center bg-gray-50">
-      <Card className="w-full max-w-sm">
-        <CardHeader>
-          <CardTitle className="text-xl">Admin — ClientHub</CardTitle>
-        </CardHeader>
-        <CardContent>
-          <Suspense fallback={<div className="text-sm text-gray-500">Caricamento...</div>}>
-            <AdminLoginForm />
-          </Suspense>
-        </CardContent>
-      </Card>
+    <div className="min-h-screen flex items-center justify-center bg-[#f9f9f9]">
+      <div className="w-full max-w-sm">
+        <div className="text-center mb-8">
+          <span className="text-2xl font-bold text-[#1A463C] tracking-tight">iamcavalli</span>
+          <p className="text-sm text-[#71717a] mt-1">Area riservata</p>
+        </div>
+        <Card className="border border-[#e5e7eb] shadow-sm">
+          <CardHeader className="pb-4">
+            <CardTitle className="text-base font-semibold text-[#1a1a1a]">Accedi</CardTitle>
+          </CardHeader>
+          <CardContent>
+            <Suspense fallback={<div className="text-sm text-[#71717a]">Caricamento...</div>}>
+              <AdminLoginForm />
+            </Suspense>
+          </CardContent>
+        </Card>
+      </div>
     </div>
   );
 }

src/app/admin/page.tsx

@@ -11,42 +11,42 @@ export default async function AdminDashboard() {
   return (
     <div>
       <div className="flex items-center justify-between mb-6">
-        <h1 className="text-2xl font-bold text-gray-900">Clienti</h1>
+        <h1 className="text-2xl font-bold text-[#1a1a1a]">Clienti</h1>
         <Button asChild>
           <Link href="/admin/clients/new">+ Nuovo cliente</Link>
         </Button>
       </div>
 
       {clients.length === 0 ? (
-        <div className="text-center py-20 text-gray-400">
+        <div className="text-center py-20 text-[#71717a]">
           <p>Nessun cliente ancora.</p>
           <p className="mt-2">
             <Link
               href="/admin/clients/new"
-              className="text-blue-600 hover:underline"
+              className="text-[#1A463C] hover:underline font-medium"
             >
               Crea il primo cliente
             </Link>
           </p>
         </div>
       ) : (
-        <div className="bg-white rounded-lg border border-gray-200 overflow-hidden">
+        <div className="bg-white rounded-lg border border-[#e5e7eb] overflow-hidden">
           <table className="w-full text-sm">
-            <thead className="bg-gray-50 border-b border-gray-200">
+            <thead className="bg-[#f9f9f9] border-b border-[#e5e7eb]">
               <tr>
-                <th className="text-left py-3 px-4 font-medium text-gray-600">
+                <th className="text-left py-3 px-4 font-medium text-[#71717a]">
                   Cliente
                 </th>
-                <th className="text-left py-3 px-4 font-medium text-gray-600">
+                <th className="text-left py-3 px-4 font-medium text-[#71717a]">
                   Totale
                 </th>
-                <th className="text-left py-3 px-4 font-medium text-gray-600">
+                <th className="text-left py-3 px-4 font-medium text-[#71717a]">
                   Acconto
                 </th>
-                <th className="text-left py-3 px-4 font-medium text-gray-600">
+                <th className="text-left py-3 px-4 font-medium text-[#71717a]">
                   Saldo
                 </th>
-                <th className="text-left py-3 px-4 font-medium text-gray-600">
+                <th className="text-left py-3 px-4 font-medium text-[#71717a]">
                   Link
                 </th>
               </tr>