Launch question bank directly from navigation

tests/web_responsive_test.gd

@@ -32,6 +32,10 @@ func _run() -> void:
 	_assert(dynamic_icon != null, "dynamic questions should expose its mode icon")
 	if dynamic_icon != null:
 		_assert(dynamic_icon.texture.resource_path == "res://assets/icons/lucide/activity.svg", "dynamic questions should use a web-safe vector icon")
+	selector._show_stage("question_bank")
+	await process_frame
+	_assert(selector.question_bank_launch_view.visible and not selector.mode_view.visible, "direct question bank navigation should show only the focused launch state")
+	_assert(selector.launch_retry_button != null and selector.launch_error_label != null, "question bank launch should retain retry and error controls")
 
 	var main_screen = load("res://scripts/ui/main.gd").new()
 	main_screen.size = host.size
@@ -43,6 +47,9 @@ func _run() -> void:
 	_assert(main_screen.theme_button.icon_alignment == HORIZONTAL_ALIGNMENT_CENTER, "the theme toggle icon should remain centered")
 	_assert(main_screen.header_panel.find_child("HeaderStats", true, false) == null, "the application header should not display rating or role labels")
 	_assert(not main_screen.account_chevron_button.visible, "nonessential account controls should collapse on phone-width headers")
+	var question_bank_nav := main_screen.sidebar.find_child("NavQuestionBank", true, false) as Button
+	_assert(question_bank_nav != null and question_bank_nav.text == "Question Bank", "the Practice navigation item should be replaced by Question Bank")
+	_assert(main_screen.sidebar.find_child("NavPractice", true, false) == null, "the sidebar should not retain a Practice navigation item")
 
 	host.queue_free()
 	await process_frame