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/fr.ts

@@ -1802,6 +1802,9 @@ export const dict = {
   'chat.revert.toast.undo': 'Revenu à {preview}',
   'chat.revert.toast.redo': 'Refait',
   'chat.revert.toast.restored': 'Restauré tous les messages',
+  'chat.toast.opencodeRestartInterrupted.title': 'Discussion interrompue',
+  'chat.toast.opencodeRestartInterrupted.description': 'OpenCode a redémarré alors qu’une réponse était encore en cours. Envoyez un message pour continuer.',
+  'chat.toast.opencodeRestartInterrupted.openSession': 'Ouvrir la session',
   'chat.errorBoundary.title': 'Erreur de discussion',
   'chat.errorBoundary.description': 'L\'interface de discussion a rencontré une erreur. Cela peut être dû à un problème de réseau temporaire ou à des données de message corrompues.',
   'chat.errorBoundary.sessionLabel': 'Session',