Replace custom gqlFetch() with proper Apollo useQuery/useMutation hooks
powered by codegen-generated TypedDocumentNode types. Key changes:
- Add GraphQL SDL schema file and codegen config for typescript-vue-apollo
- Replace all 28 raw .graphql imports with generated typed documents
- Add 12 useQuery() hooks with cache-and-network fetch policy
- Add 17 useMutation() hooks with surgical refetchQueries per mutation
- Optimistic cache update for setContactInboxHidden (instant archive UX)
- Fix contact list subtitle: show lastText instead of channel name
- Migrate login page from gqlFetch to useMutation
- WebSocket realtime now calls Apollo refetch instead of full data reload
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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