The 4 class components on UNSAFE_componentWillReceiveProps converted:
- FromNow, FireStats: state is a pure mirror of props -> getDerivedStateFromProps
- Fires: split the derived state (getDerivedStateFromProps) from the URL-
canonicalization side effect (componentDidUpdate, guarded by prevProps) so
the side effect never runs inside the pure gDSFP
- SelectionMap: marker is also locally draggable, so gDSFP would clobber a
drag -> componentDidUpdate guarded on a real center/distance value change
(no clobber, no setState loop), merged with the existing fit()
Browser-verified: /fires count, fire detail + FromNow, active-fire URL
canonicalizes to /fire/archive/:id, home SelectionMap renders stably (no
render loop). No UNSAFE_ warnings remain from our code. REST smoke
byte-identical.
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