implemented native share intent support for android and ios with chat and folder pickers

lib/view/pages/talk/search_chat.dart

@@ -5,8 +5,9 @@ import 'widgets/chat_tile.dart';
 
 class SearchChat extends SearchDelegate<GetRoomResponseObject?> {
   List<GetRoomResponseObject> chats;
+  final void Function(GetRoomResponseObject room)? onTapOverride;
 
-  SearchChat(this.chats);
+  SearchChat(this.chats, {this.onTapOverride});
 
   @override
   List<Widget>? buildActions(BuildContext context) => [
@@ -34,7 +35,11 @@ class SearchChat extends SearchDelegate<GetRoomResponseObject?> {
       itemCount: items.length,
       itemBuilder: (context, index) {
         var item = items.elementAt(index);
-        return ChatTile(data: item, disableContextActions: true);
+        return ChatTile(
+          data: item,
+          disableContextActions: true,
+          onTapOverride: onTapOverride,
+        );
       },
     );
   }

lib/view/pages/talk/widgets/chat_textfield.dart

@@ -1,15 +1,13 @@
 import 'dart:async';
-import 'dart:io';
 
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:nextcloud/nextcloud.dart';
 import 'package:persistent_bottom_nav_bar_v2/persistent_bottom_nav_bar_v2.dart';
 
-import '../../../../api/marianumcloud/files_sharing/file_sharing_api.dart';
-import '../../../../api/marianumcloud/files_sharing/file_sharing_api_params.dart';
 import '../../../../api/marianumcloud/talk/send_message/send_message.dart';
 import '../../../../api/marianumcloud/talk/send_message/send_message_params.dart';
+import '../../../../api/marianumcloud/talk/share_files_to_chat.dart';
 import '../../../../api/marianumcloud/webdav/webdav_api.dart';
 import '../../../../state/app/modules/chat/bloc/chat_bloc.dart';
 import '../../../../state/app/modules/settings/bloc/settings_cubit.dart';
@@ -36,30 +34,21 @@ class _ChatTextfieldState extends State<ChatTextfield> {
   final AsyncActionController _sendController = AsyncActionController();
   String? _sendError;
 
-  void share(String shareFolder, List<String> filePaths) {
-    for (final element in filePaths) {
-      final fileName = element.split(Platform.pathSeparator).last;
-      FileSharingApi()
-          .share(
-            FileSharingApiParams(
-              shareType: 10,
-              shareWith: widget.sendToToken,
-              path: '$shareFolder/$fileName',
-            ),
-          )
-          .then((_) {
-            if (mounted) context.read<ChatBloc>().refresh();
-          });
-    }
+  void share(List<String> uploadedRemotePaths) {
+    shareFilesToChat(
+      token: widget.sendToToken,
+      remoteFilePaths: uploadedRemotePaths,
+    ).then((_) {
+      if (mounted) context.read<ChatBloc>().refresh();
+    });
   }
 
   Future<void> mediaUpload(List<String>? paths) async {
     if (paths == null) return;
 
-    const shareFolder = 'MarianumMobile';
     unawaited(
       WebdavApi.webdav.then(
-        (webdav) => webdav.mkcol(PathUri.parse('/$shareFolder')),
+        (webdav) => webdav.mkcol(PathUri.parse('/$talkShareFolder')),
       ),
     );
 
@@ -70,8 +59,8 @@ class _ChatTextfieldState extends State<ChatTextfield> {
         withNavBar: false,
         screen: FilesUploadDialog(
           filePaths: paths,
-          remotePath: shareFolder,
-          onUploadFinished: (uploaded) => share(shareFolder, uploaded),
+          remotePath: talkShareFolder,
+          onUploadFinished: share,
           uniqueNames: true,
         ),
       ),

lib/view/pages/talk/widgets/chat_tile.dart

@@ -25,11 +25,17 @@ class ChatTile extends StatefulWidget {
   final bool disableContextActions;
   final bool hasDraft;
 
+  /// When set, replaces the default tap-into-chat behaviour. Used by the
+  /// share-intent picker to surface the room selection without opening the
+  /// chat view itself.
+  final void Function(GetRoomResponseObject room)? onTapOverride;
+
   const ChatTile({
     super.key,
     required this.data,
     this.disableContextActions = false,
     this.hasDraft = false,
+    this.onTapOverride,
   });
 
   @override
@@ -143,6 +149,10 @@ class _ChatTileState extends State<ChatTile> {
               ),
             ),
       onTap: () {
+        if (widget.onTapOverride != null) {
+          widget.onTapOverride!(widget.data);
+          return;
+        }
         if (selfUsername == null) return;
         unawaited(_setCurrentAsRead());
         final view = ChatView(