feat: add stable macOS app download to website

tests/Fixtures/welcome.mjs

@@ -90,10 +90,32 @@ if (serve) {
         const { en } = await server.ssrLoadModule(
             '/resources/js/locales/en.ts',
         );
+        const { isMacDownloadAvailable, macDownloadUrl } =
+            await server.ssrLoadModule(
+                '/resources/js/composables/useMacDownload.ts',
+            );
         const { default: Welcome } = await server.ssrLoadModule(
             '/resources/js/pages/Welcome.vue',
         );
 
+        assert.equal(
+            macDownloadUrl,
+            'https://petsch-studios.nbg1.your-objectstorage.com/releases/macos/aarch64-apple-darwin/KanbanGit.dmg',
+        );
+        const macUserAgent =
+            'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15';
+        assert.equal(isMacDownloadAvailable(macUserAgent, 0, undefined), true);
+        assert.equal(isMacDownloadAvailable(macUserAgent, 0, true), false);
+        assert.equal(isMacDownloadAvailable(macUserAgent, 5, undefined), false);
+        assert.equal(
+            isMacDownloadAvailable(
+                'Mozilla/5.0 (Windows NT 10.0)',
+                0,
+                undefined,
+            ),
+            false,
+        );
+
         const render = async (url, localization = createLocalization()) => {
             const response = await createInertiaApp({
                 page: makePage(url),