Simplify resolved wrong-answer explanation cards per design feedback

Drop the redundant header row (duplicate percentage badge + collapse
chevron), the "Why this is appropriate/less appropriate:"/"Why this
is incorrect:" heading labels, and the nested sub-box - now that
these cards live inside their own choice's colored border, all of
that was repeating what the color and position already say. Both the
selected-wrong-choice resolved follow-up and the never-selected
distractor cards now just show the plain explanation sentence, with
the leading "Correct."/"Incorrect." verdict word stripped too.

Removing the toggle chevron removes the only way to reach the
collapse/expand behavior, so that machinery (_collapse_resolved_followups,
_toggle_followup_state, the "collapsed" state field) comes out too
rather than linger unreachable.

scripts/ui/question_player.gd

@@ -1346,7 +1346,6 @@ func _submit_or_next() -> void:
 			return
 		var question_id_for_attempt := str(BlockSessionService.get_current_question().get("id", ""))
 		if BlockSessionService.session_kind in ["core", "bookmark", "review"]:
-			_collapse_resolved_followups()
 			var attempted_choice := selected_choice
 			if BlockSessionService.session_kind == "core":
 				QuestionBankService.record_first_attempt(
@@ -1558,7 +1557,7 @@ func _render_teaching_cards() -> void:
 	if takeaway == "":
 		var correct_id := str(question.get("correct_choice_id", ""))
 		var explanations: Dictionary = question.get("choice_explanations", {})
-		takeaway = _strip_correct_prefix(str(explanations.get(correct_id, "")).strip_edges())
+		takeaway = _strip_verdict_prefix(str(explanations.get(correct_id, "")).strip_edges())
 	var pearl := str(question.get("usmle_pearl", "")).strip_edges()
 	if takeaway != "":
 		_add_teaching_card("KEY TAKEAWAY", takeaway, Brand.SKY_BLUE)
@@ -1686,16 +1685,11 @@ func _render_unselected_distractor_explanations() -> void:
 			continue
 		_clear_followup_content(index)
 		var content := choice_followup_contents[index]
-		var body_content := _add_followup_body(content, false)
-		var heading := Label.new()
-		heading.text = "Why this is incorrect:"
-		_set_scaled_label(heading, 14, Color("fb5f6d"))
-		body_content.add_child(heading)
 		var explanation := Label.new()
-		explanation.text = _distractor_explanation_text(choice_id)
+		explanation.text = _strip_verdict_prefix(_distractor_explanation_text(choice_id))
 		explanation.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
 		_set_scaled_label(explanation, 14, Brand.text_color(_followup_is_dark()))
-		body_content.add_child(explanation)
+		content.add_child(explanation)
 		choice_followup_panels[index].add_theme_stylebox_override(
 			"panel",
 			_attached_panel_box(_followup_is_dark(), Color("fb7185"))
@@ -1708,16 +1702,16 @@ func _distractor_explanation_text(choice_id: String) -> String:
 	var question := BlockSessionService.get_current_question()
 	var explanations: Dictionary = question.get("choice_explanations", {})
 	var explanation := str(explanations.get(choice_id, "")).strip_edges()
-	if explanation.begins_with("Correct. "):
-		explanation = explanation.substr(9)
 	if explanation != "":
 		return explanation
 	return "Review the stem finding that makes this option less appropriate."
 
 
-func _strip_correct_prefix(value: String) -> String:
+func _strip_verdict_prefix(value: String) -> String:
 	if value.begins_with("Correct. "):
 		return value.substr(9)
+	if value.begins_with("Incorrect. "):
+		return value.substr(11)
 	return value
 
 
@@ -3162,7 +3156,6 @@ func _build_followup_panel(_index: int, choice_id: String) -> void:
 		"selected_option_text": "",
 		"was_correct": false,
 		"resolved": false,
-		"collapsed": false,
 		"has_authored_choices": bool(followup.get("has_authored_choices", false)),
 		"is_main_correct": false
 	}
@@ -3177,7 +3170,7 @@ func _append_followup_attempt(choice_id: String) -> void:
 
 func _render_active_followup(index: int, state: Dictionary) -> void:
 	var content := choice_followup_contents[index]
-	_build_followup_header(content, state, true, false)
+	_build_followup_header(content, state)
 	var body_content := _add_followup_body(content, false)
 
 	var prompt := Label.new()
@@ -3235,7 +3228,6 @@ func _resolve_followup(_followup: Dictionary, selected_button: Button, _style_se
 		state["selected_option_text"] = selected_option_text
 		state["was_correct"] = is_correct
 		state["resolved"] = true
-		state["collapsed"] = false
 		followup_states[resolved_choice_id] = state
 		_render_followup_state(resolved_choice_id)
 
@@ -3251,28 +3243,6 @@ func _unlock_after_followup() -> void:
 	_apply_saved_choice_state()
 
 
-func _collapse_resolved_followups() -> void:
-	for choice_id in followup_states.keys():
-		var state: Dictionary = followup_states[choice_id]
-		if bool(state.get("resolved", false)):
-			state["collapsed"] = true
-			followup_states[choice_id] = state
-			_render_followup_state(choice_id)
-	_apply_saved_choice_state()
-
-
-func _toggle_followup_state(choice_id: String) -> void:
-	if not followup_states.has(choice_id) or followup_required:
-		return
-	var state: Dictionary = followup_states[choice_id]
-	if not bool(state.get("resolved", false)):
-		return
-	state["collapsed"] = not bool(state.get("collapsed", false))
-	followup_states[choice_id] = state
-	_render_followup_state(choice_id)
-	_apply_saved_choice_state()
-
-
 func _render_followup_state(choice_id: String) -> void:
 	if not followup_states.has(choice_id):
 		return
@@ -3284,8 +3254,6 @@ func _render_followup_state(choice_id: String) -> void:
 	_style_followup_card(index, state)
 	if not bool(state.get("resolved", false)):
 		_render_active_followup(index, state)
-	elif bool(state.get("collapsed", false)):
-		_build_followup_header(choice_followup_contents[index], state, false, true)
 	else:
 		_build_resolved_followup(index, state)
 	choice_followup_panels[index].visible = true
@@ -3294,22 +3262,14 @@ func _render_followup_state(choice_id: String) -> void:
 
 func _build_resolved_followup(index: int, state: Dictionary) -> void:
 	var content := choice_followup_contents[index]
-	_build_followup_header(content, state, true, true)
-	var is_main_correct := bool(state.get("is_main_correct", false))
-	var body_content := _add_followup_body(content, is_main_correct)
-
-	var heading := Label.new()
-	heading.text = "Why this is appropriate:" if is_main_correct else "Why this is less appropriate:"
-	_set_scaled_label(heading, 14, Brand.SUCCESS if is_main_correct else Color("fb5f6d"))
-	body_content.add_child(heading)
-
 	var explanation := Label.new()
-	explanation.text = _choice_review_explanation(str(state.get("choice_id", "")), state)
+	explanation.text = _strip_verdict_prefix(_choice_review_explanation(str(state.get("choice_id", "")), state))
 	explanation.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
 	_set_scaled_label(explanation, 14, Brand.text_color(_followup_is_dark()))
-	body_content.add_child(explanation)
+	content.add_child(explanation)
 
-func _build_followup_header(content: VBoxContainer, state: Dictionary, expanded: bool, interactive: bool) -> void:
+
+func _build_followup_header(content: VBoxContainer, state: Dictionary) -> void:
 	var dark := _followup_is_dark()
 	var is_main_correct := bool(state.get("is_main_correct", false))
 	var accent := Brand.SUCCESS if is_main_correct else Color("fb5f6d")
@@ -3317,9 +3277,8 @@ func _build_followup_header(content: VBoxContainer, state: Dictionary, expanded:
 	row.add_theme_constant_override("separation", 10)
 	content.add_child(row)
 
-	# The choice button above this panel already shows the letter badge, choice
-	# text, and percentage, so the header only needs a spacer plus the collapse
-	# toggle - repeating "Review: B. ..." and a status icon here was redundant.
+	# The choice button above this panel already shows the letter badge and
+	# choice text, so the header only needs a spacer plus the percentage badge.
 	var spacer := Control.new()
 	spacer.size_flags_horizontal = Control.SIZE_EXPAND_FILL
 	row.add_child(spacer)
@@ -3334,17 +3293,6 @@ func _build_followup_header(content: VBoxContainer, state: Dictionary, expanded:
 		_set_scaled_label(percentage_label, 14, accent)
 		row.add_child(percentage_label)
 
-	if interactive:
-		var toggle := Button.new()
-		toggle.name = "FollowupToggle"
-		toggle.flat = true
-		toggle.tooltip_text = "Collapse review" if expanded else "Expand review"
-		toggle.icon = preload("res://assets/icons/lucide/chevron-down.svg") if expanded else preload("res://assets/icons/lucide/chevron-right.svg")
-		toggle.custom_minimum_size = Vector2(34, 30)
-		toggle.add_theme_color_override("icon_normal_color", Brand.text_color(dark))
-		toggle.pressed.connect(_toggle_followup_state.bind(str(state.get("choice_id", ""))))
-		row.add_child(toggle)
-
 
 func _add_followup_body(content: VBoxContainer, is_correct: bool) -> VBoxContainer:
 	var body := PanelContainer.new()
@@ -3390,8 +3338,6 @@ func _choice_review_explanation(choice_id: String, state: Dictionary) -> String:
 	var question := BlockSessionService.get_current_question()
 	var explanations: Dictionary = question.get("choice_explanations", {})
 	var explanation := str(explanations.get(choice_id, "")).strip_edges()
-	if explanation.begins_with("Correct. "):
-		explanation = explanation.substr(9)
 	if explanation != "":
 		return explanation
 	var teaching_point := str(state.get("teaching_point", "")).strip_edges()
@@ -3403,11 +3349,6 @@ func _choice_review_explanation(choice_id: String, state: Dictionary) -> String:
 
 
 func _ensure_answer_review_followups() -> void:
-	for attempted_id in followup_states.keys():
-		var attempted_state: Dictionary = followup_states[attempted_id]
-		if bool(attempted_state.get("resolved", false)):
-			attempted_state["collapsed"] = true
-			followup_states[attempted_id] = attempted_state
 	for choice_id in followup_attempt_order:
 		_render_followup_state(str(choice_id))