Fix simulation preview feedback

scripts/ui/study_selector.gd

@@ -260,6 +260,7 @@ func _select_simulation() -> void:
 func _preview_simulation_results() -> void:
 	pending_simulation_launch = true
 	simulation_preview_link.disabled = true
+	simulation_status_label.text = "Generating simulated exam results..."
 	ExamSimulationService.load_results_preview()
 
 
@@ -294,11 +295,11 @@ func _launch_simulation_block() -> void:
 
 func _on_simulation_failed(message: String) -> void:
 	pending_simulation_launch = false
+	_refresh_simulation_state()
 	if simulation_preview_link != null:
 		simulation_preview_link.disabled = false
 	if simulation_status_label != null:
 		simulation_status_label.text = message
-	_refresh_simulation_state()
 
 
 func _refresh_simulation_state() -> void:
@@ -330,7 +331,7 @@ func _refresh_bank_state() -> void:
 	elif state == "failed":
 		bank_status_label.text = "The question bank could not be loaded."
 	else:
-		bank_status_label.text = "Question bank will load when selected."
+		bank_status_label.text = ""
 
 
 func _start_question_bank() -> void: