simplified code across the app and consolidated duplicated helpers

lib/view/pages/ticker/ticker_view.dart

@@ -127,9 +127,9 @@ class _TickerScaffoldState extends State<TickerScaffold> {
   void initState() {
     super.initState();
     final initial = widget.initialSlug;
-    if (initial != null && _isSelectable(widget.sections, initial)) {
+    if (initial != null && _isSelectable(initial)) {
       _selectedSlug = initial;
-      _selectedTitle = _titleForSlug(initial);
+      _selectedTitle = _pageFor(initial)?.title;
     } else if (initial != null) {
       // Remembered page is gone (deleted/hidden) → drop the stale slug once
       // mounted and stay on "Aktuelles".
@@ -155,7 +155,7 @@ class _TickerScaffoldState extends State<TickerScaffold> {
     // A fresh nav can drop the open page (deleted/hidden/unpublished server
     // side) → fall back to "Aktuelles".
     final slug = _selectedSlug;
-    if (slug != null && !_isSelectable(widget.sections, slug)) _selectHome();
+    if (slug != null && !_isSelectable(slug)) _selectHome();
   }
 
   @override
@@ -165,13 +165,18 @@ class _TickerScaffoldState extends State<TickerScaffold> {
     super.dispose();
   }
 
-  bool _isSelectable(List<TickerNavSection> sections, String slug) {
-    for (final section in sections) {
+  TickerNavPage? _pageFor(String slug) {
+    for (final section in widget.sections) {
       for (final page in section.pages) {
-        if (page.slug == slug) return page.kind != TickerPageKind.redirect;
+        if (page.slug == slug) return page;
       }
     }
-    return false;
+    return null;
+  }
+
+  bool _isSelectable(String slug) {
+    final page = _pageFor(slug);
+    return page != null && page.kind != TickerPageKind.redirect;
   }
 
   void _ensureBackEntry() {
@@ -236,12 +241,14 @@ class _TickerScaffoldState extends State<TickerScaffold> {
     _removeBackEntry();
   }
 
-  void _selectPage(TickerNavPage page) {
+  void _selectPage(TickerNavPage page) => _select(page.slug, page.title);
+
+  void _select(String slug, String? title) {
     setState(() {
-      _selectedSlug = page.slug;
-      _selectedTitle = page.title;
+      _selectedSlug = slug;
+      _selectedTitle = title;
     });
-    widget.onSelectionChanged?.call(page.slug);
+    widget.onSelectionChanged?.call(slug);
     _ensureBackEntry();
   }
 
@@ -255,26 +262,12 @@ class _TickerScaffoldState extends State<TickerScaffold> {
   void _onLinkTap(String href) {
     final slug = AppRoutes.tickerSlugOf(href);
     if (slug != null && slug.isNotEmpty) {
-      setState(() {
-        _selectedSlug = slug;
-        _selectedTitle = _titleForSlug(slug);
-      });
-      widget.onSelectionChanged?.call(slug);
-      _ensureBackEntry();
+      _select(slug, _pageFor(slug)?.title);
       return;
     }
     unawaited(UrlOpener.openUrl(href));
   }
 
-  String? _titleForSlug(String slug) {
-    for (final section in widget.sections) {
-      for (final page in section.pages) {
-        if (page.slug == slug) return page.title;
-      }
-    }
-    return null;
-  }
-
   @override
   Widget build(BuildContext context) => LayoutBuilder(
     builder: (context, constraints) {