After OpenCode restarts (via 'Reload Opencode' or server reconnection),
the UI's cached model metadata (context windows, pricing, etc.) was
never refreshed — the cache was fetched once at boot and reused forever.
This meant new/updated models from providers were invisible until a full
page reload.
Add invalidateModelMetadataCache action to useConfigStore that clears
the metadata cache and resets the in-flight tracker. Call it from
performConfigRefresh before re-loading providers.
Shyamalan Kannan
fa71954ef1