feat: Dokploy-style sidebar layout for site pages

Sidebar takes full viewport height with Pulse logo at top. No Header
on site pages — UtilityBar in content area provides theme toggle, app
launcher, notifications, and user menu. Non-site authenticated pages
keep static Header. No footer on dashboard pages.

components/dashboard/Sidebar.tsx

@@ -253,8 +253,23 @@ export default function Sidebar({
 
     return (
       <div className="flex flex-col h-full">
+        {/* Logo */}
+        <Link
+          href="/"
+          className={`flex items-center gap-2.5 px-4 py-4 border-b border-neutral-200 dark:border-neutral-800 shrink-0 ${isCollapsed ? 'justify-center' : ''}`}
+        >
+          <img
+            src="/pulse_icon_no_margins.png"
+            alt="Pulse"
+            className="w-8 h-8 shrink-0"
+          />
+          {!isCollapsed && (
+            <span className="text-lg font-bold text-neutral-900 dark:text-white tracking-tight">Pulse</span>
+          )}
+        </Link>
+
         {/* Site Picker */}
-        <div className="pt-4 pb-2">
+        <div className="pt-3 pb-2">
           <SitePicker sites={sites} currentSiteId={siteId} collapsed={isCollapsed} />
         </div>
 
@@ -319,7 +334,7 @@ export default function Sidebar({
 
       {/* Desktop sidebar */}
       <aside
-        className={`hidden lg:flex flex-col shrink-0 border-r border-neutral-200 dark:border-neutral-800 bg-white dark:bg-neutral-900 transition-[width] duration-200 overflow-hidden ${
+        className={`hidden lg:flex flex-col shrink-0 border-r border-neutral-200 dark:border-neutral-800 bg-white dark:bg-neutral-900 transition-[width] duration-200 ${
           collapsed ? 'w-[68px]' : 'w-60'
         }`}
       >