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/uk.ts

@@ -2038,6 +2038,9 @@ export const dict: Record<I18nKey, string> = {
   "chat.revert.toast.undo": "Відкочено до {preview}",
   "chat.revert.toast.redo": "Повторено",
   "chat.revert.toast.restored": "Всі повідомлення відновлено",
+  "chat.toast.opencodeRestartInterrupted.title": "Чат перервано",
+  "chat.toast.opencodeRestartInterrupted.description": "OpenCode перезапустився, поки відповідь ще формувалася. Надішліть повідомлення, щоб продовжити.",
+  "chat.toast.opencodeRestartInterrupted.openSession": "Відкрити сесію",
   "chat.errorBoundary.title": "Помилка чату",
   "chat.errorBoundary.description": "В інтерфейсі чату сталася помилка. Причиною може бути тимчасова проблема з мережею або пошкоджені дані повідомлення.",
   "chat.errorBoundary.sessionLabel": "Сесія",