When reopening a Gemini CLI history session, session/load fails with
"Authentication required" and the fallback session/new overwrites the
DB external_id with a new session ID that has no corresponding file,
causing all historical messages to disappear.
- Skip session/new when session/load returns "Authentication required"
- Add Gemini to the parser fallback so stale external_ids recover via
folder_path + started_at matching
- Guard externalIdSavedRef for existing conversations to prevent
session/new from overwriting the persisted external_id
- Only update conversation status on disconnect when user has sent a
message, avoiding spurious "completed" flips on pure history views
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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