neon: set keyboardType for url fields

packages/neon/neon/lib/src/pages/login.dart

@@ -198,6 +198,7 @@ class _LoginPageState extends State<LoginPage> {
                                 decoration: const InputDecoration(
                                   hintText: 'https://...',
                                 ),
+                                keyboardType: TextInputType.url,
                                 initialValue: widget.serverURL,
                                 validator: (final input) => validateHttpUrl(
                                   context,

packages/neon/neon_news/lib/dialogs/add_feed.dart

@@ -59,6 +59,7 @@ class _NewsAddFeedDialogState extends State<NewsAddFeedDialog> {
                     decoration: const InputDecoration(
                       hintText: 'https://...',
                     ),
+                    keyboardType: TextInputType.url,
                     validator: (final input) => validateHttpUrl(context, input),
                     onFieldSubmitted: (final _) {
                       submit();