The workspace screen was prefetching per-provider model lists via
`useProviderModels`, which fanned out N parallel
`list_provider_models_request`s that bypassed `ProviderSnapshotManager`
and spawned each provider fresh on every call (e.g. repeated copilot
ENOENT errors). The return value was never consumed.
Replace it with `useProvidersSnapshot(serverId, workspaceDirectory)` so
warmup goes through the shared, deduped, TTL-cached snapshot path that
consumers already read from.
Mohamed Boudra
07d10f55f9