fix(core/chat): surface DNS/network guidance on stream errors (#377) #381

Job	Run time
Build aarch64-unknown-linux-musl	19m 35s
Build x86_64-apple-darwin	23m 1s
Build aarch64-apple-darwin	21m 10s
Build x86_64-unknown-linux-musl	20m 14s
Build x86_64-pc-windows-msvc	27m 22s
Publish prerelease (all targets)	5s
Run fallback build-fast	9m 1s
Post Artifact Links	0s
	2h 0m 28s

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