Connect graphical CCS interviews to cases

scripts/ui/main.gd

@@ -345,6 +345,7 @@ func _build_ui() -> void:
 	if FeatureFlags.ccs_cases_2_enabled():
 		var ccs_cases_2 := preload("res://scripts/ui/ccs_cases_2_screen.gd").new()
 		ccs_cases_2.name = "CcsCases2"
+		ccs_cases_2.main = self
 		screens_container.add_child(ccs_cases_2)
 		screens["ccs_cases_2"] = ccs_cases_2
 
@@ -501,7 +502,9 @@ func _on_navigation_pressed(key: String) -> void:
 		"question_bank": show_screen("selection", "question_bank")
 		"dynamic_questions": show_screen("dynamic_questions")
 		"exams": show_screen("simulation_history")
-		"ccs": show_screen("ccs_hub")
+		"ccs":
+			CCSService.launch_origin = "ccs"
+			show_screen("ccs_hub")
 		"ccs_cases_2": show_screen("ccs_cases_2")
 		"flashcards": show_screen("flashcards_study")
 		"performance": show_screen("profile")