full upgrade (#31)

* ✨ chore: update CI workflow to include testing and multi-arch build (#29)

* ✨ chore: remove unused dependencies from package-lock.json and updated to a better local dev environment (#30)

* ✨ test: add unit tests

* ✨ test: add unit tests for whole project

* ✨ feat: add whatwg-fetch for improved fetch support

* ✨ chore: update Node.js version to 22 in workflow

* ✨ refactor: update types and improve email handling tests

* ✨ refactor: remove unused imports

* ✨ fix: normalize image name to lowercase in workflows

* ✨ fix: ensure Docker image names are consistently lowercase

* ✨ chore: update

* ✨ chore: update base URL to use secret variable

* ✨ chore: update to login to ghcr

* ✨ fix: add missing 'fi' to close if statement in workflow

app/__tests__/__mocks__/mock-fetch-sitemap.ts

@@ -0,0 +1,12 @@
+export function mockFetch(responseText: string) {
+  return jest.fn().mockImplementation((url: string) => {
+    // Check if the URL being requested is our sitemap endpoint.
+    if (url.includes('/api/sitemap')) {
+      return Promise.resolve({
+        ok: true,
+        text: () => Promise.resolve(responseText),
+      });
+    }
+    return Promise.reject(new Error(`Unknown URL: ${url}`));
+  });
+}