Update Send button bg color (#5170)

* Update Send button bg color

Change the gradient bg to accent/rest.

* Tidy-up ComposerToolbar to match iOS 18 Figma.

Also simplifies the tests a bit.

* Add a .glassEffect to Compound's SendButton.

* Add a border to TimelineReplyView.

Also use the same sizes in both the message bubbles and the composer.

* Change icon size and container in message bubbles

- Container size = 36x36px
- Icon size = 24x24px

* Update icon of reply contents to be 24x24

* Update the VoiceMessageButton to match the designs.

* Adopt Liquid Glass in the ComposerToolbar.

* Generate and fix snapshots.

---------

Co-authored-by: Doug <douglase@element.io>

ElementX/Sources/Screens/Timeline/View/TimelineView.swift

@@ -143,6 +143,7 @@ struct TimelineView_Previews: PreviewProvider { // Not testable as this preview
     static let roomProxyMock = JoinedRoomProxyMock(.init(id: "stable_id",
                                                          name: "Preview room"))
     static let roomViewModel = RoomScreenViewModel.mock(roomProxyMock: roomProxyMock)
+    static let composerViewModel = ComposerToolbarViewModel.mock()
     static let timelineViewModel = TimelineViewModel(roomProxy: roomProxyMock,
                                                      timelineController: MockTimelineController(),
                                                      userSession: UserSessionMock(.init()),
@@ -159,7 +160,7 @@ struct TimelineView_Previews: PreviewProvider { // Not testable as this preview
         ElementNavigationStack {
             RoomScreen(context: roomViewModel.context,
                        timelineContext: timelineViewModel.context,
-                       composerToolbar: ComposerToolbar.mock())
+                       composerToolbar: ComposerToolbar(context: composerViewModel.context))
         }
     }
 }