HOLI-11062: add guest mode

apps/web/public/documents/privacyPolicy_de.html

apps/web/public/documents/privacyPolicy_en.html

core/auth/screens/Login.tsx

core/i18n/locales/de.json

core/i18n/locales/en.json

core/screens/onboarding/OnboardingInitializer.tsx

...reens/onboarding/__tests__/OnboardingInitializer.test.tsx

.../onboarding/helpers/__tests__/guestModeAsyncStore.test.ts

core/screens/onboarding/helpers/guestModeAsyncStore.ts

...creens/onboarding/helpers/onboardingUserDataAsyncStore.ts

...creens/onboarding/hooks/__tests__/onboardingState.test.ts

core/screens/onboarding/hooks/__tests__/useGuestMode.test.ts

core/screens/onboarding/hooks/onboardingState.ts

core/screens/onboarding/hooks/useGuestMode.ts

core/screens/onboarding/steps/CreateAccount.tsx

core/screens/onboarding/steps/EmailVerification.tsx

...screens/onboarding/steps/__tests__/CreateAccount.test.tsx

...ens/onboarding/steps/__tests__/EmailVerification.test.tsx

core/screens/userprofile/components/AnonymousProfileView.tsx

...rofile/components/__tests__/AnonymousProfileView.test.tsx