feat: implement account switcher component and state management

- Add AccountSwitcher component for managing user accounts with UI for switching, adding, and logging out.
- Create account state manager to handle snapshots of account-specific states for efficient switching.
- Introduce utility functions for account management, including ID generation and avatar color assignment.
- Implement Zustand store for account management, supporting addition, removal, and state retrieval of accounts.

locales/it/common.json

@@ -34,6 +34,9 @@
     "dismiss": "Chiudi",
     "or": "o",
     "sign_in_sso": "Accedi con SSO",
+    "add_account_title": "Aggiungi account",
+    "add_account_subtitle": "Accedi con un altro account",
+    "cancel": "Annulla",
     "website": "Sito web",
     "imprint": "Note legali",
     "privacy_policy": "Informativa sulla privacy",
@@ -58,6 +61,11 @@
     "storage_free": "Libero",
     "storage_total": "Totale",
     "sign_out": "Esci",
+    "sign_out_of": "Disconnetti da {account}",
+    "sign_out_all": "Disconnetti da tutti gli account",
+    "add_account": "Aggiungi account",
+    "set_as_default": "Imposta come predefinito",
+    "switch_account": "Cambia account",
     "contacts": "Contatti",
     "calendar": "Calendario",
     "settings": "Impostazioni",