chore: remove cat images that caused testing errors

[mimarz]

Removed cat images and @asset that was causing resolving errors.
Replaced cat images with 1x1 transparent gif.

 ✓  @digdir/designsystemet-react (chromium)  src/components/dropdown/dropdown.test.tsx (2 tests) 33ms
1:43:43 PM [vite] (client) Pre-transform error: Failed to resolve import "@assets/img/cats/Cat 3.jpg" from "packages/react/src/components/avatar/avatar.stories.tsx". Does the file exist?
  Plugin: vite:import-analysis
  File: /Users/michaelmarszalek/Documents/designsystemet/packages/react/src/components/avatar/avatar.stories.tsx:1:17
  1  |  "use strict";
  2  |  import { Fragment, jsxDEV } from "react/jsx-dev-runtime";
  3  |  import cat1 from "@assets/img/cats/Cat 3.jpg";
     |                    ^
  4  |  import { BriefcaseIcon } from "@navikt/aksel-icons";
  5  |  import { themeColors } from "../../../stories/constants";
1:43:43 PM [vite] (client) Pre-transform error: Failed to resolve import "@assets/img/cats/Cat 1.jpg" from "packages/react/src/components/card/card.stories.tsx". Does the file exist?
  Plugin: vite:import-analysis
  File: /Users/michaelmarszalek/Documents/designsystemet/packages/react/src/components/card/card.stories.tsx:1:17
  1  |  "use strict";
  2  |  import { Fragment, jsxDEV } from "react/jsx-dev-runtime";
  3  |  import cat1 from "@assets/img/cats/Cat 1.jpg";
     |                    ^
  4  |  import cat5 from "@assets/img/cats/Cat 5.jpg";
  5  |  import { severityColors, themeColors } from "../../../stories/constants";

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storybook - 1. Apr 2026 - 14:17