Download asset to local and error fixing (#100)

* Update photo_manager pub package
* Added download endpoint for assets
* Successfully save a photo to the local device's gallery
* Save save a video to the local device's gallery
* Fixed #97
* Added download loading indicator
* Refactor and increase the font size for curated search thumbnail images
* Reposition loading animation on the search result page

mobile/pubspec.yaml

@@ -11,7 +11,7 @@ dependencies:
   flutter:
     sdk: flutter
   cupertino_icons: ^1.0.2
-  photo_manager: ^1.3.10
+  photo_manager: ^2.0.6
   flutter_hooks: ^0.18.0
   hooks_riverpod: ^2.0.0-dev.0
   hive:
@@ -33,11 +33,11 @@ dependencies:
   badges: ^2.0.2
   photo_view: ^0.13.0
   socket_io_client: ^2.0.0-beta.4-nullsafety.0
-  # mapbox_gl: ^0.15.0
   flutter_map: ^0.14.0
   flutter_udid: ^2.0.0
   package_info_plus: ^1.4.0
-
+  flutter_spinkit: ^5.1.0
+  
 dev_dependencies:
   flutter_test:
     sdk: flutter