added a swipeable media gallery for chat and folder images and videos with server previews, on-demand originals and zoom, and marked document previews in chat so they no longer pass for photos

lib/view/pages/files/files.dart

@@ -140,8 +140,12 @@ class _FilesViewState extends State<_FilesView> {
                 return ListView.builder(
                   padding: EdgeInsets.zero,
                   itemCount: files.length,
-                  itemBuilder: (context, index) =>
-                      FileElement(files[index], widget.path, bloc.refresh),
+                  itemBuilder: (context, index) => FileElement(
+                    files[index],
+                    widget.path,
+                    bloc.refresh,
+                    siblings: files,
+                  ),
                 );
               },
             ),