Update login state machine and add new login components
**Motivations:**
- Continue implementation of login state machine
- Add new login components for collect, share and sign screens
- Add utilities for login signing, validation, and publishing
- Update documentation for CNIL compliance and login workflow
- Add features for timeouts, backoff, and validator acceptance
**Root causes:**
- N/A (feature additions and improvements)
**Correctifs:**
- Update login state machine implementation
- Update graph resolver and sync service
**Evolutions:**
- Add LoginCollectShare and LoginSignScreen components
- Add useSignAndPostLogin hook
- Add login utilities: loginSign, loginPublish, loginValidation, collectSignatures
- Add sync utilities: syncUpdateGraph, syncValidate
- Add validatorsAccept utility
- Update App.tsx and LoginScreen.tsx
- Update loginBuilder and loginStateMachine services
- Add documentation for CNIL compliance, remote collection, timeouts, and validator acceptance
- Update identity types
**Pages affectées:**
- userwallet/src/App.tsx
- userwallet/src/components/LoginScreen.tsx
- userwallet/src/components/LoginCollectShare.tsx (new)
- userwallet/src/components/LoginSignScreen.tsx (new)
- userwallet/src/hooks/useSignAndPostLogin.ts (new)
- userwallet/src/services/graphResolver.ts
- userwallet/src/services/loginBuilder.ts
- userwallet/src/services/loginStateMachine.ts
- userwallet/src/services/syncService.ts
- userwallet/src/services/syncUpdateGraph.ts (new)
- userwallet/src/services/syncValidate.ts (new)
- userwallet/src/types/identity.ts
- userwallet/src/utils/relay.ts
- userwallet/src/utils/collectSignatures.ts (new)
- userwallet/src/utils/loginPublish.ts (new)
- userwallet/src/utils/loginSign.ts (new)
- userwallet/src/utils/loginValidation.ts (new)
- userwallet/src/utils/validatorsAccept.ts (new)
- userwallet/docs/synthese.md
- userwallet/docs/specs-champs-obligatoires-cnil.md
- userwallet/features/userwallet-acceptation-version-validateurs.md (new)
- userwallet/features/userwallet-dh-systematique-scan-fetch.md (new)
- features/userwallet-contrat-login-reste-a-faire.md
- features/userwallet-login-state-machine.md
- features/userwallet-validation-conformite.md
- features/userwallet-champs-obligatoires-cnil.md (new)
- features/userwallet-collecte-distante-2-devices.md (new)
- features/userwallet-timeouts-backoff.md (new)
- mempool (submodule)
- hash_list.txt
- hash_list_cache.txt
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