fix: resolve conflicting z-index values (#788)

## Description

Currently there are various z-index values that are causing:
- Toasts to be placed behind dialog blur background
- Menu being cropped off by header

## Changes Made

- Revert `z-[1000]` back to `z-50` for the header (not exactly sure why
it was bumped)
- Refactor z-indexes over 9000 to start from 1000
- Ensure z-index of toast is higher than dialog

apps/web/src/components/(dashboard)/layout/header.tsx

@@ -33,7 +33,7 @@ export const Header = ({ className, user, ...props }: HeaderProps) => {
   return (
     <header
       className={cn(
-        'supports-backdrop-blur:bg-background/60 bg-background/95 sticky top-0 z-[1000] flex h-16 w-full items-center border-b border-b-transparent backdrop-blur duration-200',
+        'supports-backdrop-blur:bg-background/60 bg-background/95 sticky top-0 z-[50] flex h-16 w-full items-center border-b border-b-transparent backdrop-blur duration-200',
         scrollY > 5 && 'border-b-border',
         className,
       )}

packages/ui/primitives/dialog.tsx

@@ -20,7 +20,7 @@ const DialogPortal = ({
 }: DialogPrimitive.DialogPortalProps & { position?: 'start' | 'end' | 'center' }) => (
   <DialogPrimitive.Portal {...props}>
     <div
-      className={cn('fixed inset-0 z-[9999] flex justify-center sm:items-center', {
+      className={cn('fixed inset-0 z-[1000] flex justify-center sm:items-center', {
         'items-start': position === 'start',
         'items-end': position === 'end',
         'items-center': position === 'center',

packages/ui/primitives/select.tsx

@@ -42,7 +42,7 @@ const SelectContent = React.forwardRef<
     <SelectPrimitive.Content
       ref={ref}
       className={cn(
-        'bg-popover text-popover-foreground animate-in fade-in-80 relative z-50 min-w-[8rem] overflow-hidden rounded-md border shadow-md',
+        'bg-popover text-popover-foreground animate-in fade-in-80 relative z-[1001] min-w-[8rem] overflow-hidden rounded-md border shadow-md',
         position === 'popper' && 'translate-y-1',
         className,
       )}

packages/ui/primitives/toast.tsx

@@ -16,7 +16,7 @@ const ToastViewport = React.forwardRef<
   <ToastPrimitives.Viewport
     ref={ref}
     className={cn(
-      'fixed top-0 z-[9999] flex max-h-screen w-full flex-col-reverse p-4 sm:bottom-0 sm:right-0 sm:top-auto sm:flex-col md:max-w-[420px]',
+      'fixed top-0 z-[1001] flex max-h-screen w-full flex-col-reverse p-4 sm:bottom-0 sm:right-0 sm:top-auto sm:flex-col md:max-w-[420px]',
       className,
     )}
     {...props}