fix: sidebar UX — move Projects under Agent, remove duplicate + in New chat

- Rename nav.agent_projects to "Projects" / "Progetti" (shorter label)
- Move the Projects collapsible section directly below the Agente Documentale
link instead of at the bottom of the nav
- Remove leading "+ " from agent.new_chat i18n keys — the button already
renders a Plus icon, causing a double "+" in the UI

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

frontend/src/components/layout/Sidebar.tsx

@@ -113,11 +113,10 @@ export default function Sidebar() {
 
       {/* Main nav */}
       <nav className="flex-1 space-y-0.5 overflow-y-auto">
-        {links.map(({ to, label, icon: Icon }) => (
+        {links.filter(l => l.to !== "/agent").slice(0, links.findIndex(l => l.to === "/agent")).map(({ to, label, icon: Icon }) => (
           <NavLink
             key={to}
             to={to}
-            end={to === "/agent"}
             className={({ isActive }) =>
               cn(
                 "flex items-center gap-2.5 rounded-md px-3 py-2 text-sm font-medium transition-colors",
@@ -132,7 +131,24 @@ export default function Sidebar() {
           </NavLink>
         ))}
 
-        {/* Agent projects sub-section */}
+        {/* Agente Documentale link */}
+        <NavLink
+          to="/agent"
+          end
+          className={({ isActive }) =>
+            cn(
+              "flex items-center gap-2.5 rounded-md px-3 py-2 text-sm font-medium transition-colors",
+              isActive
+                ? "bg-primary/10 text-primary"
+                : "text-muted-foreground hover:bg-muted hover:text-foreground"
+            )
+          }
+        >
+          <Bot className="h-4 w-4" />
+          {t("nav.agent")}
+        </NavLink>
+
+        {/* Agent projects sub-section — directly under Agente Documentale */}
         <div className="pt-1">
           <button
             onClick={() => setAgentExpanded(v => !v)}
@@ -186,6 +202,25 @@ export default function Sidebar() {
           )}
         </div>
 
+        {/* Remaining main nav links (RAG, Compliance, …) */}
+        {links.filter(l => l.to !== "/agent").slice(links.findIndex(l => l.to === "/agent")).map(({ to, label, icon: Icon }) => (
+          <NavLink
+            key={to}
+            to={to}
+            className={({ isActive }) =>
+              cn(
+                "flex items-center gap-2.5 rounded-md px-3 py-2 text-sm font-medium transition-colors",
+                isActive
+                  ? "bg-primary/10 text-primary"
+                  : "text-muted-foreground hover:bg-muted hover:text-foreground"
+              )
+            }
+          >
+            <Icon className="h-4 w-4" />
+            {t(label)}
+          </NavLink>
+        ))}
+
         {user?.role === "admin" && (
           <>
             <div className="my-2 border-t" />

frontend/src/i18n/en.json

@@ -6,7 +6,7 @@
   "nav": {
     "projects": "Cases",
     "agent": "Document Agent",
-    "agent_projects": "Agent Projects",
+    "agent_projects": "Projects",
     "rag": "AI Consultant",
     "compliance": "ENFSI Compliance",
     "admin": "Administration",
@@ -85,7 +85,7 @@
     "analyze_document": "Analyze document",
     "project": "Project",
     "new_project": "New project",
-    "new_chat": "+ New chat",
+    "new_chat": "New chat",
     "no_projects": "No projects yet",
     "no_chats": "No chats yet",
     "no_documents": "No documents yet",

frontend/src/i18n/it.json

@@ -6,7 +6,7 @@
   "nav": {
     "projects": "Perizie",
     "agent": "Agente Documentale",
-    "agent_projects": "Progetti Agente",
+    "agent_projects": "Progetti",
     "rag": "Consulente IA",
     "compliance": "Conformità ENFSI",
     "admin": "Amministrazione",
@@ -85,7 +85,7 @@
     "analyze_document": "Analizza documento",
     "project": "Progetto",
     "new_project": "Nuovo progetto",
-    "new_chat": "+ Nuova chat",
+    "new_chat": "Nuova chat",
     "no_projects": "Nessun progetto",
     "no_chats": "Nessuna chat",
     "no_documents": "Nessun documento",