Share the article count line and refresh scaffolding of Today and Learn (review items 5, 6)

articleCountLine, RefreshButton and RefreshableList live in common.dart.
LearnScreen._describe becomes _windowLabel there, and LearnScreen._section
is _kindSection like in SourcesScreen.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

lib/ui/common.dart

@@ -1,6 +1,9 @@
 import 'package:flutter/material.dart';
 import 'package:url_launcher/url_launcher.dart';
 
+import '../models/source.dart';
+import '../state/app_state.dart';
+
 /// User-facing app name. Platform launcher labels (AndroidManifest, Info.plist,
 /// web/manifest.json, windows/runner) are set separately.
 const appName = 'Tagesbyte';
@@ -33,6 +36,17 @@ const monthNames = [
 bool isSameDay(DateTime a, DateTime b) =>
     a.year == b.year && a.month == b.month && a.day == b.day;
 
+/// The line above the articles of [kind], e.g.
+/// "12 articles · last 24 h · 3 paid/ads hidden".
+String articleCountLine(AppState state, SourceKind kind) {
+  final hidden = state.hiddenCountOf(kind);
+  return '${state.articlesOf(kind).length} articles · last ${_windowLabel(state.windowOf(kind))}'
+      '${hidden > 0 ? ' · $hidden paid/ads hidden' : ''}';
+}
+
+String _windowLabel(Duration window) =>
+    window.inHours < 72 ? '${window.inHours} h' : '${window.inDays} days';
+
 Future<void> openUrl(BuildContext context, String url) async {
   final ok = await launchUrl(Uri.parse(url), mode: LaunchMode.externalApplication);
   if (!ok && context.mounted) {
@@ -41,6 +55,39 @@ Future<void> openUrl(BuildContext context, String url) async {
   }
 }
 
+/// App bar button that refreshes all Sources; off while a refresh runs.
+class RefreshButton extends StatelessWidget {
+  const RefreshButton({super.key, required this.state});
+
+  final AppState state;
+
+  @override
+  Widget build(BuildContext context) => IconButton(
+        tooltip: 'Refresh',
+        onPressed: state.loading ? null : state.refresh,
+        icon: const Icon(Icons.refresh),
+      );
+}
+
+/// A scrollable [list] that refreshes all Sources when pulled down, under a
+/// progress bar while a refresh runs and an optional [notice].
+class RefreshableList extends StatelessWidget {
+  const RefreshableList({super.key, required this.state, required this.list, this.notice});
+
+  final AppState state;
+  final Widget list;
+  final Widget? notice;
+
+  @override
+  Widget build(BuildContext context) => Column(
+        children: [
+          if (state.loading) const LinearProgressIndicator(),
+          if (notice != null) notice!,
+          Expanded(child: RefreshIndicator(onRefresh: state.refresh, child: list)),
+        ],
+      );
+}
+
 /// Centered icon + text + optional action, used for empty and error states.
 class EmptyState extends StatelessWidget {
   const EmptyState({

lib/ui/feed_screen.dart

@@ -31,7 +31,6 @@ class _FeedScreenState extends State<FeedScreen> {
             .where((a) => _sourceId == null || a.source.id == _sourceId)
             .toList();
         final sourcesInFeed = {for (final a in all) a.source.id: a.source};
-        final hidden = state.hiddenCountOf(SourceKind.news);
 
         return Scaffold(
           appBar: AppBar(
@@ -40,38 +39,23 @@ class _FeedScreenState extends State<FeedScreen> {
               children: [
                 const Text(appName),
                 Text(
-                  state.loading
-                      ? 'Loading feeds…'
-                      : '${all.length} articles · last ${state.settings.maxAgeHours} h'
-                          '${hidden > 0 ? ' · $hidden paid/ads hidden' : ''}',
+                  state.loading ? 'Loading feeds…' : articleCountLine(state, SourceKind.news),
                   style: Theme.of(context).textTheme.bodySmall,
                 ),
               ],
             ),
-            actions: [
-              IconButton(
-                tooltip: 'Refresh',
-                onPressed: state.loading ? null : state.refresh,
-                icon: const Icon(Icons.refresh),
-              ),
-            ],
+            actions: [RefreshButton(state: state)],
             bottom: PreferredSize(
               preferredSize: const Size.fromHeight(52),
               child: _filterBar(sourcesInFeed.values.toList()),
             ),
           ),
-          body: Column(
-            children: [
-              if (state.loading) const LinearProgressIndicator(),
-              if (state.feedErrors.isNotEmpty && !state.loading)
-                _ErrorBanner(errors: state.feedErrors),
-              Expanded(
-                child: RefreshIndicator(
-                  onRefresh: state.refresh,
-                  child: _list(state, visible),
-                ),
-              ),
-            ],
+          body: RefreshableList(
+            state: state,
+            notice: state.feedErrors.isNotEmpty && !state.loading
+                ? _ErrorBanner(errors: state.feedErrors)
+                : null,
+            list: _list(state, visible),
           ),
         );
       },

lib/ui/learn_screen.dart

@@ -3,6 +3,7 @@ import 'package:flutter/material.dart';
 import '../models/source.dart';
 import '../state/app_state.dart';
 import 'article_screen.dart';
+import 'common.dart';
 import 'feed_screen.dart';
 
 /// Reading that keeps for days, from the Sources that aren't News: one
@@ -22,37 +23,23 @@ class LearnScreen extends StatelessWidget {
       builder: (context, _) => Scaffold(
         appBar: AppBar(
           title: const Text('Learn'),
-          actions: [
-            IconButton(
-              tooltip: 'Refresh',
-              onPressed: state.loading ? null : state.refresh,
-              icon: const Icon(Icons.refresh),
-            ),
-          ],
+          actions: [RefreshButton(state: state)],
         ),
-        body: Column(
-          children: [
-            if (state.loading) const LinearProgressIndicator(),
-            Expanded(
-              child: RefreshIndicator(
-                onRefresh: state.refresh,
-                child: ListView(
-                  padding: const EdgeInsets.fromLTRB(12, 0, 12, 24),
-                  children: [for (final kind in kinds) ..._section(context, kind)],
-                ),
-              ),
-            ),
-          ],
+        body: RefreshableList(
+          state: state,
+          list: ListView(
+            padding: const EdgeInsets.fromLTRB(12, 0, 12, 24),
+            children: [for (final kind in kinds) ..._kindSection(context, kind)],
+          ),
         ),
       ),
     );
   }
 
-  List<Widget> _section(BuildContext context, SourceKind kind) {
+  List<Widget> _kindSection(BuildContext context, SourceKind kind) {
     final theme = Theme.of(context);
     final muted = theme.colorScheme.onSurfaceVariant;
     final articles = state.articlesOf(kind);
-    final hidden = state.hiddenCountOf(kind);
     final hasSources = state.enabledSources.any((s) => s.kind == kind);
     return [
       Padding(
@@ -63,8 +50,7 @@ class LearnScreen extends StatelessWidget {
             Text(kind.label,
                 style: theme.textTheme.titleMedium?.copyWith(color: theme.colorScheme.primary)),
             Text(
-              '${articles.length} articles · last ${_describe(state.windowOf(kind))}'
-              '${hidden > 0 ? ' · $hidden paid/ads hidden' : ''}',
+              articleCountLine(state, kind),
               style: theme.textTheme.bodySmall?.copyWith(color: muted),
             ),
           ],
@@ -92,7 +78,4 @@ class LearnScreen extends StatelessWidget {
         ),
     ];
   }
-
-  static String _describe(Duration window) =>
-      window.inHours < 72 ? '${window.inHours} h' : '${window.inDays} days';
 }