Add `prefers-color-scheme` query for theme fallback — radicle-explorer

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   reporter: "list",
   globalSetup: "./tests/support/globalSetup",
   use: {
     colorScheme: "dark",
     actionTimeout: 5000,
     baseURL: "http://localhost:3001",
     trace: "retain-on-failure",

 }
 function loadTheme(): Theme {
   const { matches } = window.matchMedia("(prefers-color-scheme: dark)");
   const storedTheme = window.localStorage.getItem("theme");
   if (storedTheme === null) {
     return "dark";
     return matches ? "dark" : "light";
   } else {
     return storedTheme as Theme;
   }