ui(dropdown): keep menu items single-line + widen container to w-60

Add whitespace-nowrap to the DropdownMenuItem primitive so every
dropdown row stays on a single line app-wide, and bump the sidebar
3-dot overflow menu from w-56 to w-60. The Benachrichtigungs-Center
label (23 chars) plus its Bell icon and the default text-sm cap sat
right at the 14-rem ceiling and wrapped at the hyphen on sub-pixel
rounding.

src/components/layout/sidebar-nav.tsx

@@ -117,7 +117,7 @@ function SidebarUserSection({ collapsed }: { collapsed: boolean }) {
     <DropdownMenuContent
       side="right"
       align="end"
-      className="w-56"
+      className="w-60"
       sideOffset={8}
     >
       <div className="flex items-center gap-3 px-2 py-2">

src/components/ui/dropdown-menu.tsx

@@ -74,7 +74,13 @@ function DropdownMenuItem({
       data-inset={inset}
       data-variant={variant}
       className={cn(
-        "focus:bg-accent focus:text-accent-foreground data-[variant=destructive]:text-destructive data-[variant=destructive]:focus:bg-destructive/10 dark:data-[variant=destructive]:focus:bg-destructive/20 data-[variant=destructive]:focus:text-destructive data-[variant=destructive]:*:[svg]:!text-destructive [&_svg:not([class*='text-'])]:text-muted-foreground relative flex min-h-11 cursor-default items-center gap-2 rounded-sm px-2 py-2 text-sm outline-hidden select-none data-[disabled]:pointer-events-none data-[disabled]:opacity-50 data-[inset]:pl-8 [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4",
+        // v1.4.37 W4a item 2 — `whitespace-nowrap` keeps every
+        // dropdown row on a single line (the sidebar 3-dot menu's
+        // "Benachrichtigungs-Center" otherwise wrapped at the
+        // hyphen on sub-pixel rounding inside the legacy w-56
+        // container). Applies app-wide so the top-bar w-48 menus
+        // get the same protection.
+        "focus:bg-accent focus:text-accent-foreground data-[variant=destructive]:text-destructive data-[variant=destructive]:focus:bg-destructive/10 dark:data-[variant=destructive]:focus:bg-destructive/20 data-[variant=destructive]:focus:text-destructive data-[variant=destructive]:*:[svg]:!text-destructive [&_svg:not([class*='text-'])]:text-muted-foreground relative flex min-h-11 cursor-default items-center gap-2 rounded-sm px-2 py-2 text-sm whitespace-nowrap outline-hidden select-none data-[disabled]:pointer-events-none data-[disabled]:opacity-50 data-[inset]:pl-8 [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4",
         className,
       )}
       {...props}