Fix question review interactions

tests/post_answer_review_test.gd

@@ -8,6 +8,9 @@ func _initialize() -> void:
 	_test_reference_url_filter()
 	_test_correct_feedback_does_not_auto_advance()
 	_test_correct_review_locks_answer_interactions()
+	_test_eliminated_choice_uses_rich_text_strikeout()
+	_test_explanation_highlighting_has_no_status_heading()
+	_test_collapsed_followup_review_expands()
 	quit(1 if failures > 0 else 0)
 
 
@@ -74,6 +77,70 @@ func _test_correct_review_locks_answer_interactions() -> void:
 	player.free()
 
 
+func _test_eliminated_choice_uses_rich_text_strikeout() -> void:
+	var player = load("res://scripts/ui/question_player.gd").new()
+	player.choice_buttons.append(Button.new())
+	player.choice_percent_labels.append(Label.new())
+	var strike_label := RichTextLabel.new()
+	strike_label.bbcode_enabled = true
+	player.choice_top_labels.append(strike_label)
+	player.choice_followup_panels.append(PanelContainer.new())
+	player.eliminated = ["A"]
+	player.presented_choices = [{"id": "A", "text": "Observation only"}]
+	player._set_choice_button_text(0, player.presented_choices[0])
+	_assert(player.choice_buttons[0].text == "", "eliminated choice should not use combining characters in button text")
+	_assert(strike_label.text == "[s]A. Observation only[/s]", "eliminated choice should use native rich-text strikeout")
+	_assert(not "[eliminated]" in strike_label.text, "eliminated choice should not include a redundant label")
+	player.choice_buttons[0].free()
+	player.choice_percent_labels[0].free()
+	strike_label.free()
+	player.choice_followup_panels[0].free()
+	player.free()
+
+
+func _test_explanation_highlighting_has_no_status_heading() -> void:
+	var player = load("res://scripts/ui/question_player.gd").new()
+	player.explanation_label = RichTextLabel.new()
+	player.explanation_label.bbcode_enabled = true
+	player.explanation_plain_text = "The key finding supports observation."
+	player.explanation_highlights[""] = [{"start": 4, "end": 15}]
+	player._render_explanation()
+	_assert(not player.explanation_label.text.begins_with("[b]Correct"), "explanation should not repeat the inferred correct status")
+	_assert("[bgcolor=yellow]" in player.explanation_label.text, "explanation text should support highlighting")
+	player.explanation_label.free()
+	player.free()
+
+
+func _test_collapsed_followup_review_expands() -> void:
+	var player = load("res://scripts/ui/question_player.gd").new()
+	var panel := PanelContainer.new()
+	var content := VBoxContainer.new()
+	panel.add_child(content)
+	player.choice_buttons.append(Button.new())
+	player.choice_percent_labels.append(Label.new())
+	player.choice_top_labels.append(RichTextLabel.new())
+	player.choice_followup_panels.append(panel)
+	player.choice_followup_contents.append(content)
+	player.next_button = Button.new()
+	player.presented_choices = [{"id": "B", "text": "Wrong answer"}]
+	player.followup_states["B"] = {
+		"choice_id": "B", "choice_text": "Wrong answer", "prompt": "Why?",
+		"selected_option_text": "Finding", "was_correct": false,
+		"teaching_point": "Review the finding.", "resolved": true, "collapsed": true
+	}
+	player._render_followup_state("B")
+	var review_button := content.get_child(0) as Button
+	_assert(review_button != null, "collapsed follow-up should render a review button")
+	review_button.pressed.emit()
+	_assert(not bool(player.followup_states["B"].get("collapsed", true)), "review button should expand the resolved follow-up")
+	player.choice_buttons[0].free()
+	player.choice_percent_labels[0].free()
+	player.choice_top_labels[0].free()
+	player.next_button.free()
+	panel.free()
+	player.free()
+
+
 func _assert(condition: bool, message: String) -> void:
 	if condition:
 		return