further improved accessibility across the application and add tooltips to action buttons

lib/widget/details_bottom_sheet.dart

@@ -22,13 +22,18 @@ Future<void> showDetailsBottomSheet(
         padding: EdgeInsets.only(
           bottom: 16 + MediaQuery.viewInsetsOf(sheetContext).bottom,
         ),
-        child: Column(
-          mainAxisSize: MainAxisSize.min,
-          crossAxisAlignment: CrossAxisAlignment.stretch,
-          children: [
-            if (header != null) ...[header, const Divider(height: 1)],
-            ...children(sheetContext),
-          ],
+        // Ohne dieses innere Material malt ListTile-Ink aufs Sheet-Material
+        // außerhalb des Scrollbereichs und stretcht beim Overscroll nicht mit.
+        child: Material(
+          type: MaterialType.transparency,
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            crossAxisAlignment: CrossAxisAlignment.stretch,
+            children: [
+              if (header != null) ...[header, const Divider(height: 1)],
+              ...children(sheetContext),
+            ],
+          ),
         ),
       ),
     ),