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/pt/common.json

@@ -34,6 +34,9 @@
     "dismiss": "Fechar",
     "or": "ou",
     "sign_in_sso": "Entrar com SSO",
+    "add_account_title": "Adicionar conta",
+    "add_account_subtitle": "Entrar com outra conta",
+    "cancel": "Cancelar",
     "website": "Site",
     "imprint": "Informações legais",
     "privacy_policy": "Política de privacidade",
@@ -58,6 +61,11 @@
     "storage_free": "Livre",
     "storage_total": "Total",
     "sign_out": "Sair",
+    "sign_out_of": "Sair de {account}",
+    "sign_out_all": "Sair de todas as contas",
+    "add_account": "Adicionar conta",
+    "set_as_default": "Definir como padrão",
+    "switch_account": "Trocar conta",
     "contacts": "Contatos",
     "calendar": "Calendário",
     "settings": "Configurações",