feat(news,calendar): improve corporate calendar filters and news sentiment dialogs

FinlyticApp/lib/features/calendar/bloc/calendar_state.dart

@@ -25,9 +25,29 @@ class CalendarLoaded extends CalendarState {
     this.selectedDate,
   });
 
+  static bool matchesCategory(String eventType, String category) {
+    if (category == 'Alle' || category.isEmpty) return true;
+    final catKey = category.toLowerCase();
+    final t = eventType.toLowerCase();
+
+    if (catKey.contains('earn') || catKey.contains('quartal') || catKey.contains('ergebnis')) {
+      return t.contains('earn') || t.contains('quart') || t.contains('ergebnis') || t.contains('finan') || t.contains('report') || t.contains('bilanz') || t == 'event';
+    }
+    if (catKey.contains('ex') || catKey.contains('div')) {
+      return (t.contains('ex') || t.contains('div') || t.contains('ausschütt')) && !t.contains('pay') && !t.contains('zahl');
+    }
+    if (catKey.contains('pay') || catKey.contains('zahl')) {
+      return t.contains('pay') || t.contains('zahl') || t.contains('auszahl');
+    }
+    if (catKey.contains('split')) {
+      return t.contains('split');
+    }
+    return t.contains(catKey) || t == catKey;
+  }
+
   List<CorporateEventModel> get filteredEvents {
     return allEvents.where((e) {
-      if (selectedCategory != 'Alle' && e.eventType != selectedCategory) {
+      if (!matchesCategory(e.eventType, selectedCategory)) {
         return false;
       }
       if (selectedDate != null) {

FinlyticApp/lib/features/calendar/views/corporate_calendar_screen.dart

@@ -33,7 +33,7 @@ class _CorporateCalendarScreenContent extends StatelessWidget {
 
   const _CorporateCalendarScreenContent({required this.apiClient});
 
-  static const List<String> categories = ['Alle', 'Earnings', 'ExDividend', 'Payout'];
+  static const List<String> categories = ['Alle', 'Earnings', 'ExDividend', 'Payout', 'Split'];
 
   @override
   Widget build(BuildContext context) {
@@ -86,6 +86,7 @@ class _CorporateCalendarScreenContent extends StatelessWidget {
                                     if (cat == 'Earnings') label = 'Quartalsergebnisse';
                                     if (cat == 'ExDividend') label = 'Ex-Dividendentage';
                                     if (cat == 'Payout') label = 'Zahlungstage';
+                                    if (cat == 'Split') label = 'Aktiensplits';
 
                                     return Padding(
                                       padding: const EdgeInsets.only(right: 8),

FinlyticApp/lib/features/calendar/widgets/calendar_event_tile.dart

@@ -36,12 +36,21 @@ class CalendarEventTile extends StatelessWidget {
     Color badgeColor = AppTheme.primaryEmerald;
     String typeLabel = 'Quartalszahlen';
 
-    if (type == 'ExDividend') {
-      badgeColor = AppTheme.accentCyan;
-      typeLabel = 'Ex-Dividende';
-    } else if (type == 'Payout') {
+    final tLower = type.toLowerCase();
+    if (tLower.contains('ex') || tLower.contains('div') || tLower.contains('ausschütt')) {
+      if (tLower.contains('pay') || tLower.contains('zahl')) {
+        badgeColor = Colors.amber;
+        typeLabel = 'Zahlungstag';
+      } else {
+        badgeColor = AppTheme.accentCyan;
+        typeLabel = 'Ex-Dividende';
+      }
+    } else if (tLower.contains('pay') || tLower.contains('zahl') || tLower.contains('auszahl')) {
       badgeColor = Colors.amber;
       typeLabel = 'Zahlungstag';
+    } else if (tLower.contains('split')) {
+      badgeColor = Colors.purpleAccent;
+      typeLabel = 'Aktiensplit';
     }
 
     return GlassContainer(