feat: adds bottom sheet map and actions (#19726)

* reduce timeline rebuilds

* feat: adds bottom sheet map and actions (#19692)

* adds bottom sheet map and actions

* PR feedbacks

* only reload the asset viewer if asset is changed

* styling tweak

---------

Co-authored-by: shenlong-tanwen <139912620+shalong-tanwen@users.noreply.github.com>
Co-authored-by: Alex <alex.tran1502@gmail.com>

* rename singleton and remove event prefix

* adds bottom sheet map and actions

* PR feedbacks

* refactor: use provider for viewer state

* feat: adds top and bottom app bar

* add safe area to bottom app bar

* change app and bottom bar color

* viewer - always have black background

* use the full width for the bottom sheet on landscape as well

* constraint the bottom sheet to not expand all the way

* add padding for location details in landscape

---------

Co-authored-by: shenlong-tanwen <139912620+shalong-tanwen@users.noreply.github.com>
Co-authored-by: Alex <alex.tran1502@gmail.com>

mobile/lib/providers/infrastructure/action.provider.dart

@@ -56,7 +56,10 @@ class ActionNotifier extends Notifier<void> {
     final Set<BaseAsset> assets = switch (source) {
       ActionSource.timeline =>
         ref.read(multiSelectProvider.select((s) => s.selectedAssets)),
-      ActionSource.viewer => {ref.read(currentAssetNotifier)},
+      ActionSource.viewer => switch (ref.read(currentAssetNotifier)) {
+          BaseAsset asset => {asset},
+          null => {},
+        },
     };
 
     return switch (T) {