Improve question review and image handling

tests/post_answer_review_test.gd

@@ -7,6 +7,7 @@ func _initialize() -> void:
 	_test_reference_normalization()
 	_test_reference_url_filter()
 	_test_correct_feedback_does_not_auto_advance()
+	_test_correct_review_locks_answer_interactions()
 	quit(1 if failures > 0 else 0)
 
 
@@ -58,6 +59,21 @@ func _test_correct_feedback_does_not_auto_advance() -> void:
 	player.free()
 
 
+func _test_correct_review_locks_answer_interactions() -> void:
+	var player = load("res://scripts/ui/question_player.gd").new()
+	player.current_answer = {"is_correct": true}
+	player.selected_choice = "A"
+	player.presented_choices = [{"id": "A", "text": "First"}, {"id": "B", "text": "Second"}]
+	player._select_choice(1)
+	_assert(player.selected_choice == "A", "correct review should reject answer selection changes")
+	var right_click := InputEventMouseButton.new()
+	right_click.button_index = MOUSE_BUTTON_RIGHT
+	right_click.pressed = true
+	player._choice_gui_input(right_click, 1)
+	_assert(player.eliminated.is_empty(), "correct review should reject answer strike-through changes")
+	player.free()
+
+
 func _assert(condition: bool, message: String) -> void:
 	if condition:
 		return