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

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(