add macOS support for ad loading and improve timestamp handling

pubspec.lock

@@ -121,6 +121,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.0.2"
+  dio:
+    dependency: transitive
+    description:
+      name: dio
+      sha256: d90ee57923d1828ac14e492ca49440f65477f4bb1263575900be731a3dac66a9
+      url: "https://pub.dev"
+    source: hosted
+    version: "5.9.0"
+  dio_web_adapter:
+    dependency: transitive
+    description:
+      name: dio_web_adapter
+      sha256: "7586e476d70caecaf1686d21eee7247ea43ef5c345eab9e0cc3583ff13378d78"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.1"
   email_validator:
     dependency: transitive
     description:
@@ -169,6 +185,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "8.3.7"
+  file_saver:
+    dependency: "direct main"
+    description:
+      name: file_saver
+      sha256: "017a127de686af2d2fbbd64afea97052d95f2a0f87d19d25b87e097407bf9c1e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.2.14"
   fixnum:
     dependency: transitive
     description: