refactor(cursor-models): remove tier property from Cursor model configurations

- Removed the 'tier' property from Cursor model configurations and related UI components.
- Updated relevant files to reflect the removal of tier-related logic and display elements.
- This change simplifies the model structure and UI, focusing on essential attributes.

apps/ui/src/components/views/board-view/shared/model-selector.tsx

@@ -180,14 +180,6 @@ export function ModelSelector({
                           Thinking
                         </Badge>
                       )}
-                      {option.tier && (
-                        <Badge
-                          variant={option.tier === 'free' ? 'default' : 'secondary'}
-                          className={cn('text-xs', isSelected && 'bg-primary-foreground/20')}
-                        >
-                          {option.tier}
-                        </Badge>
-                      )}
                     </div>
                   </button>
                 );