chore: remove unused stylelint dependency

Remove stylelint and stylelint-config-standard as they were not being
used properly in the project. The linting setup relies on Prettier
and ESLint which are sufficient for the codebase needs.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: p-m-p

.stylelintrc.json

@@ -61,8 +61,6 @@
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
     "storybook": "^9.0.9",
-    "stylelint": "^16.12.0",
-    "stylelint-config-standard": "^38.0.0",
     "typescript": "^5.7.2",
     "vite": "^6.0.6",
     "vite-tsconfig-paths": "^5.1.4",