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 with the existing dynamic-route pattern used for game detail pages and the reusable game card. Trace the publisher and game data model, then locate the data-access tests and Playwright setup. Done means prerendered publisher pages show the publisher details and games, links work from existing cards or detail pages, and unit and e2e coverage passes.