Add post-answer review and per-question loading

tests/post_answer_review_test.gd

@@ -0,0 +1,65 @@
+extends SceneTree
+
+var failures := 0
+
+
+func _initialize() -> void:
+	_test_reference_normalization()
+	_test_reference_url_filter()
+	_test_correct_feedback_does_not_auto_advance()
+	quit(1 if failures > 0 else 0)
+
+
+func _test_reference_normalization() -> void:
+	var service = load("res://scripts/autoload/question_bank_service.gd").new()
+	var references: Array = service._normalize_references([{
+		"Title": "Clinical guideline",
+		"Publisher": "Example Society",
+		"Url": "https://example.org/guideline",
+		"Supports": "Recommended management",
+		"AccessedOn": "2026-07-14",
+		"Reviewer": "reviewer"
+	}])
+	_assert(references.size() == 1, "a structured reference should be retained")
+	_assert(references[0].get("title", "") == "Clinical guideline", "reference title should be normalized")
+	_assert(references[0].get("accessed_on", "") == "2026-07-14", "reference access date should be normalized")
+	service.free()
+
+
+func _test_reference_url_filter() -> void:
+	var player = load("res://scripts/ui/question_player.gd").new()
+	_assert(player._is_safe_reference_url("https://example.org/source"), "HTTPS references should be accepted")
+	_assert(not player._is_safe_reference_url("http://example.org/source"), "HTTP references should be rejected")
+	_assert(not player._is_safe_reference_url("javascript:alert(1)"), "script URLs should be rejected")
+	player.references_container = VBoxContainer.new()
+	player._show_references([
+		{"title": "Clinical guideline", "publisher": "Example Society", "url": "https://example.org/source"},
+		{"title": "Unsafe", "publisher": "Example", "url": "http://example.org/source"}
+	])
+	_assert(player.references_container.visible, "valid references should show the references section")
+	_assert(player.references_container.get_child_count() == 2, "the section should contain a heading and one safe link")
+	var link := player.references_container.get_child(1) as LinkButton
+	_assert(link != null and link.text == "Clinical guideline - Example Society", "reference link text should identify its source")
+	player.references_container.free()
+	player.free()
+
+
+func _test_correct_feedback_does_not_auto_advance() -> void:
+	var player = load("res://scripts/ui/question_player.gd").new()
+	player.next_button = Button.new()
+	player.skip_button = Button.new()
+	player.feedback_fog = ColorRect.new()
+	player.pending_correct_advance = false
+	player._trigger_correct_feedback()
+	_assert(not player.pending_correct_advance, "correct feedback must not schedule automatic advancement")
+	player.next_button.free()
+	player.skip_button.free()
+	player.feedback_fog.free()
+	player.free()
+
+
+func _assert(condition: bool, message: String) -> void:
+	if condition:
+		return
+	failures += 1
+	push_error(message)