fix: server-side UA mobile detection — prevents desktop sidebar flash on mobile before JS hydration

src/components/ui/sidebar.tsx

@@ -54,6 +54,7 @@ function useSidebar() {
 
 function SidebarProvider({
   defaultOpen = true,
+  defaultIsMobile = false,
   open: openProp,
   onOpenChange: setOpenProp,
   className,
@@ -62,10 +63,11 @@ function SidebarProvider({
   ...props
 }: React.ComponentProps<"div"> & {
   defaultOpen?: boolean
+  defaultIsMobile?: boolean
   open?: boolean
   onOpenChange?: (open: boolean) => void
 }) {
-  const isMobile = useIsMobile()
+  const isMobile = useIsMobile(defaultIsMobile)
   const [openMobile, setOpenMobile] = React.useState(false)
 
   // This is the internal state of the sidebar.