refactor(hub-client): AuthProvider interface for GIS coupling#219
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Introduce an `AuthProvider` interface (sign-in button, silent renewal, signout). `LoginScreen`, `useAuth`, `authService`, and `main.tsx` depend on it via React context; only `auth/GoogleAuthProvider.tsx` and `main.tsx` import `@react-oauth/google` directly. Auth-disabled mode uses a `noopAuthProvider` so consumers never branch on null. No behaviour change. Plan: `claude-notes/plans/2026-05-20-auth-provider-interface.md`.
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Why
@react-oauth/googleis imported across five production files; with a second backend that becomes ten. A thin interface caps the blast radius — adding another provider later means writing one file and swapping one factory call inmain.tsx.noopAuthProviderinstead ofAuthProvider | nullbecause every alternative forced consumers to branch (provider?.useSilentRenewal(...)is also a conditional hook call, whichreact-hooks/rules-of-hooksflags).What
AuthProviderinterface (sign-in button, silent renewal, signout) consumed via React context.LoginScreen,useAuth,authService,main.tsxno longer import@react-oauth/googledirectly — onlyauth/GoogleAuthProvider.tsxandmain.tsx's SDK-loader wrap do.VITE_GOOGLE_CLIENT_IDunset) modelled bynoopAuthProvider; consumers don't branch on null.claude-notes/plans/2026-05-20-auth-provider-interface.md.