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/es/common.json

@@ -34,6 +34,9 @@
     "dismiss": "Cerrar",
     "or": "o",
     "sign_in_sso": "Iniciar sesión con SSO",
+    "add_account_title": "Agregar cuenta",
+    "add_account_subtitle": "Iniciar sesión con otra cuenta",
+    "cancel": "Cancelar",
     "website": "Sitio web",
     "imprint": "Aviso legal",
     "privacy_policy": "Política de privacidad",
@@ -58,6 +61,11 @@
     "storage_free": "Libre",
     "storage_total": "Total",
     "sign_out": "Cerrar sesión",
+    "sign_out_of": "Cerrar sesión de {account}",
+    "sign_out_all": "Cerrar sesión de todas las cuentas",
+    "add_account": "Agregar cuenta",
+    "set_as_default": "Establecer como predeterminada",
+    "switch_account": "Cambiar cuenta",
     "contacts": "Contactos",
     "calendar": "Calendario",
     "settings": "Configuración",