feat(04-02): admin projects list + client detail project cards

- NavBar: add Progetti (/admin/projects) and Impostazioni links
- ProjectRow: project table row with €/h calc (accepted_total / tracked hours)
- /admin/projects: table listing all projects with value, payments, timer, €/h
- /admin/projects/new: create form with client select + ?client_id pre-selection
- project-actions: createProject, archiveProject, unarchiveProject, updateProjectAcceptedTotal
- /admin/clients/[id]: rewritten to show project cards grid instead of tabbed workspace
- getAllClientsWithPayments: add projectBrands[] and ltv (sum of project accepted_totals)
- ClientRow: show project brand names under client name, LTV column replaces Totale

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

src/app/admin/projects/page.tsx

@@ -0,0 +1,49 @@
+import { getAllProjectsWithPayments } from "@/lib/admin-queries";
+import { ProjectRow } from "@/components/admin/ProjectRow";
+import Link from "next/link";
+
+export const revalidate = 0;
+
+export default async function ProjectsPage() {
+  const projects = await getAllProjectsWithPayments();
+
+  return (
+    <div>
+      <div className="mb-6 flex items-center justify-between">
+        <h1 className="text-2xl font-bold text-[#1a1a1a]">Progetti</h1>
+        <Link
+          href="/admin/projects/new"
+          className="text-sm bg-[#1A463C] text-white px-4 py-2 rounded-lg hover:bg-[#1A463C]/90 transition-colors"
+        >
+          + Nuovo Progetto
+        </Link>
+      </div>
+
+      {projects.length === 0 ? (
+        <div className="bg-white rounded-xl border border-[#e5e7eb] p-12 text-center">
+          <p className="text-[#71717a]">Nessun progetto ancora. Creane uno dal dettaglio di un cliente.</p>
+        </div>
+      ) : (
+        <div className="bg-white rounded-xl border border-[#e5e7eb] overflow-hidden">
+          <table className="w-full">
+            <thead className="bg-[#f9f9f9] border-b border-[#e5e7eb]">
+              <tr>
+                <th className="text-left py-3 px-4 text-xs font-semibold text-[#71717a] uppercase tracking-wider">Progetto</th>
+                <th className="text-left py-3 px-4 text-xs font-semibold text-[#71717a] uppercase tracking-wider">Valore</th>
+                <th className="text-left py-3 px-4 text-xs font-semibold text-[#71717a] uppercase tracking-wider">Acconto</th>
+                <th className="text-left py-3 px-4 text-xs font-semibold text-[#71717a] uppercase tracking-wider">Saldo</th>
+                <th className="text-left py-3 px-4 text-xs font-semibold text-[#71717a] uppercase tracking-wider">Timer</th>
+                <th className="text-left py-3 px-4 text-xs font-semibold text-[#71717a] uppercase tracking-wider">€/h</th>
+              </tr>
+            </thead>
+            <tbody>
+              {projects.map((project) => (
+                <ProjectRow key={project.id} project={project} />
+              ))}
+            </tbody>
+          </table>
+        </div>
+      )}
+    </div>
+  );
+}