feat(gui): display inventory

src/main.py

@@ -1,10 +1,16 @@
 #!/usr/bin/env python3
 
+
+from pathlib import Path
+
+from bookstore.inventory import Inventory
 from ui.app import App
 
 
 def main() -> None:
-    app = App()
+    db_path = Path("db.sqlite3")
+    inventory = Inventory(db_path)
+    app = App(inventory)
     app.run()