feat(store): add test for clearing dispatch error on successful merge

- Introduced a new test case in speaker_meta_test.go to verify that the LastDispatchError is cleared when a successful dispatch status is merged.
- Updated MergeSpeakerMetaJSON function in speaker_meta.go to clear LastDispatchError if LastDispatchStatus is "ok".
- Enhanced speakerDispatchError function in network-metrics.ts to handle stale dispatch errors after successful agent sync.

web/src/lib/network/network-metrics.ts

@@ -277,6 +277,12 @@ export function formatSpeakerError(raw: string | null | undefined): FormattedSpe
 }
 
 export function speakerDispatchError(s: SpeakerRow): FormattedSpeakerError | null {
+	const liveRev = s.live?.agent_last_applied_revision_id?.trim();
+	const pub = s.published_revision_id?.trim();
+	// CP meta can keep a stale dispatch error after a later successful agent sync.
+	if (s.live?.agent_ok && liveRev && pub && liveRev === pub) {
+		return null;
+	}
 	return formatSpeakerError(s.last_dispatch_error);
 }