App polish part 2 (#1118)

- Fix sheet backgrounds in dark mode.
- Fix background colours for reaction buttons.
- Reply view layout.
- Update separator colours.
- Don't show sender name/avatar in DMs.
- Fix inconsistent line heights with formatted body text.
- Use plain text for reply
- Increase tappable size of collapsed state changes button.
- Blockquote layout and text colour.
- Tap to expand the topic in room details.
- Change the topic and security font size in room details.
- Add cancel button when inviting someone to an existing room.
- Reword Add Friends to Add People in start chat screen.
- Update compound.

ElementX/Sources/Screens/RoomDetailsScreen/RoomDetailsScreenCoordinator.swift

@@ -104,6 +104,8 @@ final class RoomDetailsScreenCoordinator: CoordinatorProtocol {
             guard let self else { return }
             
             switch result {
+            case .cancel:
+                navigationStackCoordinator?.setSheetCoordinator(nil)
             case .proceed:
                 break
             case .invite(let users):
@@ -114,7 +116,7 @@ final class RoomDetailsScreenCoordinator: CoordinatorProtocol {
         }
         .store(in: &cancellables)
         
-        parameters.navigationStackCoordinator?.setSheetCoordinator(userIndicatorController) { [weak self] in
+        navigationStackCoordinator?.setSheetCoordinator(userIndicatorController) { [weak self] in
             self?.selectedUsers.value = []
         }
     }