Don't lose simulator state (modifications) when logging in/out

src/lib/components/BudgetConnexionModal.svelte

src/lib/components/NavBar.svelte

src/lib/server/auditors/queries.ts

src/routes/auth/login/+server.ts

src/routes/auth/login_callback/+server.ts

src/routes/auth/logout/+server.ts

src/routes/auth/logout_callback/+server.ts

src/routes/auth/prepare/+page.svelte

src/routes/auth/restore_state/+page.svelte