fix: settle busy sessions after managed OpenCode restart (#3002)

* fix: reconcile busy sessions after managed OpenCode restart

Forced health-check restarts previously rebound the event stream without
settling in-flight turns, so sessions stayed busy with no terminal state.
Interrupt those sessions, classify health failures, and retain bounded
process diagnostics for post-restart diagnosis.

Fixes #2943

Co-authored-by: serkraser <serkraser@gmail.com>

* fix: surface interrupted chats after OpenCode restart

Complete unfinished assistant turns as aborted once the session is
authoritatively idle, and show a persistent toast so users can continue
instead of remaining silently stranded.

Fixes #2943

Co-authored-by: serkraser <serkraser@gmail.com>

* fix: redact Basic auth credentials in restart diagnostics

The key/value sanitizer stopped at whitespace, so Authorization: Basic
credentials survived in stderr tails and health snapshots. Redact the
scheme token before that rule runs.

Co-authored-by: serkraser <serkraser@gmail.com>

packages/ui/src/lib/i18n/messages/ko.ts

@@ -2062,6 +2062,9 @@ export const dict: Record<I18nKey, string> = {
   'chat.revert.toast.undo': '{preview}(으)로 되돌림',
   'chat.revert.toast.redo': '다시 실행',
   'chat.revert.toast.restored': '모든 메시지 복원됨',
+  'chat.toast.opencodeRestartInterrupted.title': '채팅이 중단되었습니다',
+  'chat.toast.opencodeRestartInterrupted.description': '응답이 진행 중인 동안 OpenCode가 다시 시작되었습니다. 계속하려면 메시지를 보내세요.',
+  'chat.toast.opencodeRestartInterrupted.openSession': '세션 열기',
   'chat.errorBoundary.title': '채팅 오류',
   'chat.errorBoundary.description': '채팅 인터페이스에서 오류가 발생했습니다. 일시적인 네트워크 이슈 또는 손상된 메시지 데이터 때문일 수 있습니다.',
   'chat.errorBoundary.sessionLabel': '세션',