refactored data providers with centralized cache resolution, unified UI using custom dialogs and bottom sheets, and enhanced network error handling for Dio and TLS errors

lib/view/pages/more/share/select_share_type_dialog.dart

@@ -5,34 +5,43 @@ import '../../../../widget/share_position_origin.dart';
 
 enum ShareTargetType { qr }
 
-class SelectShareTypeDialog extends StatelessWidget {
-  const SelectShareTypeDialog({super.key});
-
-  @override
-  Widget build(BuildContext context) => SimpleDialog(
-      children: [
-        ListTile(
-          leading: const Icon(Icons.qr_code_2_outlined),
-          title: const Text('Per QR-Code'),
-          trailing: const Icon(Icons.arrow_right),
-          onTap: () => Navigator.of(context).pop(ShareTargetType.qr),
-        ),
-        ListTile(
-          leading: const Icon(Icons.link_outlined),
-          title: const Text('Per Link teilen'),
-          trailing: const Icon(Icons.arrow_right),
-          onTap: () {
-            Navigator.of(context).pop();
-            SharePlus.instance.share(ShareParams(
-              sharePositionOrigin: SharePositionOrigin.get(context),
-              subject: 'App Teilen',
-              text: 'Hol dir die für das Marianum maßgeschneiderte App:'
-                  '\n\nAndroid: https://play.google.com/store/apps/details?id=eu.mhsl.marianum.mobile.client '
-                  '\niOS: https://apps.apple.com/us/app/marianum-fulda/id6458789560 '
-                  '\n\nViel Spaß!',
-            ));
-          },
-        )
-      ],
-    );
+/// Bottom sheet that lets the user pick how they want to share the app.
+/// Resolves with [ShareTargetType.qr] for the QR option, or `null` when the
+/// sheet is dismissed (link sharing fires immediately and resolves null).
+Future<ShareTargetType?> showSelectShareTypeSheet(BuildContext context) {
+  return showModalBottomSheet<ShareTargetType>(
+    context: context,
+    isScrollControlled: true,
+    showDragHandle: true,
+    useSafeArea: true,
+    builder: (sheetCtx) => SafeArea(
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          ListTile(
+            leading: const Icon(Icons.qr_code_2_outlined),
+            title: const Text('Per QR-Code'),
+            trailing: const Icon(Icons.arrow_right),
+            onTap: () => Navigator.of(sheetCtx).pop(ShareTargetType.qr),
+          ),
+          ListTile(
+            leading: const Icon(Icons.link_outlined),
+            title: const Text('Per Link teilen'),
+            trailing: const Icon(Icons.arrow_right),
+            onTap: () {
+              Navigator.of(sheetCtx).pop();
+              SharePlus.instance.share(ShareParams(
+                sharePositionOrigin: SharePositionOrigin.get(sheetCtx),
+                subject: 'App Teilen',
+                text: 'Hol dir die für das Marianum maßgeschneiderte App:'
+                    '\n\nAndroid: https://play.google.com/store/apps/details?id=eu.mhsl.marianum.mobile.client '
+                    '\niOS: https://apps.apple.com/us/app/marianum-fulda/id6458789560 '
+                    '\n\nViel Spaß!',
+              ));
+            },
+          ),
+        ],
+      ),
+    ),
+  );
 }