impelement geckoview intent handling via viewport api; fix lints and ui issues

packages/flutter_tor/example/pubspec.yaml

@@ -17,19 +17,9 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-
   flutter_tor:
-    # When depending on this package from a real application you should use:
-    #   flutter_tor: ^x.y.z
-    # See https://dart.dev/tools/pub/dependencies#version-constraints
-    # The example app is bundled with the plugin so we use a path dependency on
-    # the parent directory to use the current plugin's version.
     path: ../
 
-  # The following adds the Cupertino Icons font to your application.
-  # Use with the CupertinoIcons class for iOS style icons.
-  cupertino_icons: ^1.0.8
-
   # HTTP client for testing Tor connectivity
   http: any
 
@@ -37,17 +27,11 @@ dependencies:
   socks5_proxy: any
 
 dev_dependencies:
-  integration_test:
-    sdk: flutter
+  flutter_lints: ^6.0.0
   flutter_test:
     sdk: flutter
-
-  # The "flutter_lints" package below contains a set of recommended lints to
-  # encourage good coding practices. The lint set provided by the package is
-  # activated in the `analysis_options.yaml` file located at the root of your
-  # package. See that file for information about deactivating specific lint
-  # rules and activating additional ones.
-  flutter_lints: ^6.0.0
+  integration_test:
+    sdk: flutter
 
 # For information on the generic Dart part of this file, see the
 # following page: https://dart.dev/tools/pub/pubspec