Add a publisher page listing that publisher's games

When a backer likes a game, a natural next step is to see what else the same publisher has made. Adding a dedicated, prerendered page for each publisher that lists their games improves catalog navigation. The data model already links games to publishers, so this is a focused addition that follows the existing dynamic-route pattern used for game detail pages.

Acceptance criteria

• Each publisher has a prerendered page (using getStaticPaths() + export const prerender = true) listing all of their games
• The page shows the publisher name and description, and reuses the existing game card for the listing
• Publisher names on the game card and/or game detail page link to the publisher page
• The page follows the project's styling and accessibility guidelines and includes data-testid attributes
• A data-access helper returns games for a given publisher with unit test coverage, and Playwright e2e tests cover the publisher page

Start by finding the existing dynamic route for game detail pages, the game card component, and the publisher-linked data model. Add the prerendered publisher route with getStaticPaths(), implement and unit-test the publisher game lookup, then run the existing unit and Playwright test suites to verify links, accessibility attributes, and the complete publisher listing.