build(config): remove unused Flutter dependencies (#16)

Remove dependencies and asset declarations that are no longer referenced so the resolved package graph stays smaller and easier to verify.

pubspec.lock

@@ -65,14 +65,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.0.7"
-  cupertino_icons:
-    dependency: "direct main"
-    description:
-      name: cupertino_icons
-      sha256: "41e005c33bd814be4d3096aff55b1908d419fde52ca656c8c47719ec745873cd"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.0.9"
   fake_async:
     dependency: transitive
     description:
@@ -216,14 +208,6 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
-  google_fonts:
-    dependency: "direct main"
-    description:
-      name: google_fonts
-      sha256: ba03d03bcaa2f6cb7bd920e3b5027181db75ab524f8891c8bc3aa603885b8055
-      url: "https://pub.dev"
-    source: hosted
-    version: "6.3.3"
   google_mobile_ads:
     dependency: "direct main"
     description:
@@ -385,7 +369,7 @@ packages:
     source: hosted
     version: "1.9.1"
   path_provider:
-    dependency: "direct main"
+    dependency: transitive
     description:
       name: path_provider
       sha256: "50c5dd5b6e1aaf6fb3a78b33f6aa3afca52bf903a8a5298f53101fdaee55bbcd"