The previous implementation stored query invalidation logic (mutateCurrentWorkspace) and
isFetching state (isValidatingCurrentWorkspace) in React Context, causing QuotaPanel to
flash a loading spinner on every settings tab switch due to a useEffect calling
invalidateQueries on mount. This violated separation of concerns and React best practices.
- Remove mutateCurrentWorkspace and isValidatingCurrentWorkspace from AppContext
- Add useInvalidateCurrentWorkspace hook in service layer (consistent with project pattern)
- Remove redundant useEffect + invalidateQueries in ModelProviderPage
- QuotaPanel now derives loading from !currentWorkspace.id instead of external prop
- Update custom-web-app-brand to use the new service-layer hook
72b96ba972