A failed turn leaves a red error banner inline in the transcript. These
errors are renderer-local state (never persisted) and stay pinned to the
message until the session is reloaded, so a stale, no-longer-relevant
error (e.g. a transient provider/inference error) lingers with no way to
clear it.
Add an 'x' dismiss button inside the existing MessagePrimitive.Error
block. Clicking it clears the error from BOTH the live $messages view
and the per-runtime session cache — the view first, because
preserveLocalAssistantErrors re-grafts any still-errored message it finds
in the view onto the next session.info flush, so clearing only the cache
would let the heartbeat resurrect the banner. A bare error placeholder
(no streamed content) is dropped entirely; a turn that streamed partial
output before failing keeps its text and just sheds the error.
The control only renders when an onDismissError handler is wired, so
secondary/embedded Thread usages are unaffected. Adds the dismissError
string to all four locales (en/ja/zh/zh-hant) and two behavior tests.
Co-authored-by: Teknium <127238744+teknium1@users.noreply.github.com>
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