style: refine Pipeline fidelity to Quiet Luxury reference

- Sidebar: revert to white palette (drop emerald pass), remove right border
- Table: softer slate-100 borders, remove min-height gap, "Mostrando N di M
  lead" footer, empty Tag cell = dashed-circle add button
- SegmentedToggle: more visible track (slate-200/60), neutral active text
- Kanban: roomy fixed-width columns (280px, horizontal scroll), sober column
  headers (no colored dots), airy cards matching mock (name+badge/email/
  company+"Tag +"); 6 stages + @dnd-kit intact

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

src/components/admin/AdminSidebar.tsx

@@ -41,7 +41,7 @@ export function AdminSidebar({ collapsed = false }: { collapsed?: boolean }) {
   return (
     <aside
       className={cn(
-        "shrink-0 min-h-screen bg-[#1A463C] border-r border-emerald-950/20 flex flex-col overflow-hidden",
+        "shrink-0 min-h-screen bg-[#1A463C] flex flex-col overflow-hidden",
         "transition-[width] duration-350 ease-[cubic-bezier(0.4,0,0.2,1)]",
         collapsed ? "w-16" : "w-[200px]"
       )}
@@ -54,7 +54,7 @@ export function AdminSidebar({ collapsed = false }: { collapsed?: boolean }) {
         )}
       >
         {!collapsed && (
-          <span className="font-bold text-emerald-50 tracking-tight text-sm whitespace-nowrap">
+          <span className="font-bold text-white tracking-tight text-sm whitespace-nowrap">
             iamcavalli
           </span>
         )}
@@ -73,14 +73,14 @@ export function AdminSidebar({ collapsed = false }: { collapsed?: boolean }) {
                 "flex items-center py-2.5 rounded-lg text-sm transition-all duration-200",
                 rowClass,
                 active
-                  ? "bg-white/[0.08] text-white font-medium shadow-sm"
-                  : "text-emerald-200/70 hover:text-white hover:bg-white/5"
+                  ? "bg-white/15 text-white font-medium"
+                  : "text-white/65 hover:text-white hover:bg-white/10"
               )}
             >
               <Icon
                 size={16}
                 strokeWidth={1.8}
-                className={cn("shrink-0", active && "text-emerald-400")}
+                className="shrink-0"
               />
               {!collapsed && <span className="whitespace-nowrap">{label}</span>}
             </Link>
@@ -96,7 +96,7 @@ export function AdminSidebar({ collapsed = false }: { collapsed?: boolean }) {
             collapsed ? "justify-center px-0" : "justify-between px-3"
           )}
         >
-          {!collapsed && <span className="text-xs text-emerald-200/50">Tema</span>}
+          {!collapsed && <span className="text-xs text-white/50">Tema</span>}
           <ThemeToggle />
         </div>
         <button
@@ -104,7 +104,7 @@ export function AdminSidebar({ collapsed = false }: { collapsed?: boolean }) {
           title={collapsed ? "Esci" : undefined}
           className={cn(
             "flex items-center py-2.5 w-full rounded-lg text-sm transition-all duration-200",
-            "text-red-300/80 hover:text-red-200 hover:bg-red-950/20",
+            "text-white/65 hover:text-white hover:bg-white/10",
             rowClass
           )}
         >