refactor: swap Button ghost/outline semantics, clean up ImageLightbox thumbnail

ghost now means transparent bg (no fill); outline keeps cream bg with subtle border.
Remove magnify icon overlay from ImageLightbox thumbnail — hover cursor-zoom-in is sufficient.
Close button updated to variant="outline" for cream-on-blue contrast in the dialog.

src/shared/styles/theme.css

@@ -439,4 +439,5 @@
 /* Lightbox dialog backdrop */
 dialog.lightbox::backdrop {
   background-color: rgba(4, 28, 243, 0.25);
+  backdrop-filter: blur(4px);
 }

src/shared/ui/Button/ui/Button.test.tsx

@@ -24,11 +24,11 @@ describe('Button', () => {
     });
     it('applies outline variant', () => {
       render(<Button variant="outline">Go</Button>);
-      expect(screen.getByRole('button')).toHaveClass('bg-transparent');
+      expect(screen.getByRole('button')).toHaveClass('bg-cream');
     });
     it('applies ghost variant', () => {
       render(<Button variant="ghost">Go</Button>);
-      expect(screen.getByRole('button')).toHaveClass('bg-cream');
+      expect(screen.getByRole('button')).toHaveClass('bg-transparent');
     });
   });
   describe('sizes', () => {

src/shared/ui/Button/ui/Button.tsx

@@ -46,9 +46,9 @@ const VARIANTS = {
   secondary:
     'brutal-border bg-blue text-cream shadow-brutal hover:-translate-x-0.5 hover:-translate-y-0.5 hover:shadow-brutal-md active:translate-x-0.5 active:translate-y-0.5 active:shadow-brutal-xs',
   outline:
-    'brutal-border bg-transparent text-blue shadow-brutal hover:-translate-x-0.5 hover:-translate-y-0.5 hover:shadow-brutal-md active:translate-x-0.5 active:translate-y-0.5 active:shadow-brutal-xs',
-  ghost:
     'brutal-border border-blue/35 bg-cream text-blue hover:border-blue hover:bg-blue/10 active:bg-blue active:text-cream',
+  ghost:
+    'brutal-border bg-transparent text-blue hover:-translate-x-0.5 hover:-translate-y-0.5 active:translate-x-0.5 active:translate-y-0.5',
 } as const satisfies Record<ButtonVariant, string>;
 
 const SIZES = {

src/shared/ui/ImageLightbox/ui/ImageLightbox.test.tsx

@@ -56,7 +56,7 @@ describe('ImageLightbox', () => {
     it('clicking inside the dialog (not backdrop) does not close', () => {
       render(<ImageLightbox {...DEFAULT_PROPS} />);
       const dialog = document.querySelector('dialog') as HTMLDialogElement;
-      const inner = dialog.querySelector('div') as HTMLDivElement;
+      const inner = dialog.querySelector('img') as HTMLImageElement;
       fireEvent.click(inner);
       expect(HTMLDialogElement.prototype.close).not.toHaveBeenCalled();
     });

src/shared/ui/ImageLightbox/ui/ImageLightbox.tsx

@@ -2,7 +2,7 @@
 
 import Image from 'next/image';
 import { useRef } from 'react';
-import { CloseIcon, MagnifyIcon } from '$shared/assets/icons';
+import { CloseIcon } from '$shared/assets/icons';
 import { cn } from '$shared/lib';
 import { Button } from '$shared/ui/Button';
 
@@ -66,10 +66,6 @@ export function ImageLightbox({ src, alt, className }: Props) {
         className={cn('relative block w-full aspect-video overflow-hidden cursor-zoom-in', className)}
       >
         <Image src={src} alt={alt} fill className="object-cover" />
-        {/* Magnify hint — pointer-events-none so clicks pass through to the button */}
-        <span aria-hidden={true} className="absolute bottom-2 right-2 bg-cream text-blue p-1 pointer-events-none">
-          <MagnifyIcon />
-        </span>
       </button>
 
       <dialog
@@ -77,13 +73,18 @@ export function ImageLightbox({ src, alt, className }: Props) {
         aria-label={alt}
         onClick={handleBackdropClick}
         onKeyUp={handleBackdropKeyUp}
-        className="lightbox relative bg-blue brutal-border shadow-brutal-xl p-0 max-w-5xl w-full"
+        className="lightbox fixed inset-0 m-auto relative bg-blue brutal-border p-0 overflow-hidden"
       >
-        <div className="relative aspect-video w-full">
+        {/* Native img so the dialog sizes to the image — next/image fill requires a pre-sized container */}
         {/* aria-hidden: the dialog element itself carries the accessible label */}
-          <Image src={src} alt={alt} fill className="object-contain" aria-hidden={true} />
-        </div>
-        <Button variant="ghost" size="sm" onClick={close} aria-label="Close image" className="absolute top-3 right-3">
+        {/* eslint-disable-next-line @next/next/no-img-element */}
+        <img
+          src={src}
+          alt={alt}
+          aria-hidden={true}
+          className="block max-w-[calc(100vw-2rem)] max-h-[calc(100vh-2rem)] w-auto h-auto"
+        />
+        <Button variant="outline" size="sm" onClick={close} aria-label="Close image" className="absolute top-3 right-3">
           <CloseIcon />
         </Button>
       </dialog>