feat(tests): integrate Playwright and Vitest for testing, add CI pipeline, and update dependencies

- Added Playwright configuration for end-to-end testing.
- Integrated Vitest for unit testing with setup files.
- Updated package.json scripts for testing commands.
- Created CI pipeline for automated testing and builds.
- Added various test cases for components and pages.
- Updated .gitignore to exclude Playwright and coverage.
- Enhanced ModsList component with additional class for styling.

src/components/ModsList.tsx

@@ -196,7 +196,7 @@ export default function ModsList({ allMods, locale }: ModsListProps) {
         {paginatedMods.length > 0 ? (
           paginatedMods.map((mod) => (
             <a
-              className="flex w-full flex-col gap-4 border-transparent transition-colors duration-100 hover:opacity-90"
+              className="mod-card flex w-full flex-col gap-4 border-transparent transition-colors duration-100 hover:opacity-90"
               href={`/mods/${mod.id}`}
               key={mod.id}
             >