Add category-based related games to game detail pages

[Copilot]

Game detail pages now surface discoverability by showing other games from the same category, while handling categories with no peers cleanly. This adds a dedicated data-access path and wires it into the detail page UI.

• Data access: related game query

  • Added getRelatedGames(db, id) in src/lib/games.ts.
  • Looks up the source game category, returns games in that category ordered by title, and excludes the source game.
  • Returns [] when the game is missing or has no category.

• Game detail page UX

  • Updated src/pages/game/[id].astro to fetch related games alongside the primary game.
  • Added a Related games section with:
    • linked related titles when available
    • explicit empty state when none exist

• Unit coverage

  • Extended src/lib/games.test.ts with focused tests for:
    • same-category filtering + self-exclusion
    • empty result when no related games exist

export async function getRelatedGames(db: Database, id: number): Promise<Game[]> {
  const gameRow = await db
    .select({ categoryId: games.categoryId })
    .from(games)
    .where(eq(games.id, id))
    .get();

  if (!gameRow || gameRow.categoryId === null) return [];

  const rows = await baseGamesQuery(db)
    .where(and(eq(games.categoryId, gameRow.categoryId), ne(games.id, id)))
    .orderBy(asc(games.title));

  return rows.map(mapGame);
}

• Fixes Show related games on the game details page #15

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