fix(desktop): refresh externally written sessions

[Futahua]

What changed

Hermes Desktop now reconciles the bounded local session list every five seconds while visible. The reconciliation is guarded against overlapping requests and retains the existing last-known list on transient failures.

Why

Sessions written by another local Hermes surface, such as the CLI, TUI, or a phone companion, update the authoritative state.db but do not emit on the current Desktop renderer websocket. The sidebar therefore remained stale until Desktop restarted.

Impact

Externally-created local sessions appear in the normal Desktop sidebar without navigation, focus changes, or an application restart.

Validation

• full Desktop TypeScript typecheck passed
• ESLint passed for the modified hook
• production Desktop build and unpacked package succeeded
• live acceptance: with Desktop open, an external CLI session was created and the sidebar count changed from 10 to 11 without restarting

[GottZ]

This was generated by AI during triage.

Summary

Two PRs address external Desktop session updates, but at different layers: #37766 refreshes the selected transcript and messaging list, while #70183 reconciles the general bounded sidebar session list for sessions created by other local Hermes surfaces.

Related pull requests

• #37766 [closed] related — (+415/-0) — keep closed as implemented on main: it adds guarded active-transcript read repair, revision checks, and busy-state race protection; contributor verification confirms the equivalent, including profile-aware reads and visibility refresh, was merged in #57636.
• #70183 related — (+36/-2) — merge: it adds a non-overlapping five-second visible poll of refreshSessions, specifically covering externally created local CLI/TUI/phone-companion sessions that the already-merged active messaging-session refresh does not reconcile into the general sidebar list.

Suggested consolidation

Merge #70183 because its diff closes the remaining general sidebar-list gap and complements rather than duplicates the active messaging transcript implementation already merged via #57636. Keep #37766 closed as superseded by that merged implementation; no additional duplicate PR needs closing.

Cross-PR triage: Reviewed 2 pull requests and 0 issues in this complex. Each diff was read against this issue; Assessment working set: 17 kB of PR diffs, 2 kB of issue/PR text, 2 kB of discussion (3 comments), 0 verify verdicts. verdicts reflect diff content, not PR titles. Part of an automated triage batch.

[teknium1]

Thanks for addressing the externally-written session-list gap. This is an automated hermes-sweeper review; current main now provides the requested behavior through a broader event-driven implementation.

• tui_gateway/server.py:3059 watches state.db and state.db-wal as the cross-process signal and broadcasts sessions.changed.
• apps/desktop/src/app/contrib/hooks/use-background-sync.ts:299 consumes that signal and coalesces refreshSessions() for the stored sidebar list.
• This shipped via merged PR Desktop: event-driven live sync — gateway change broadcasts replace the always-on polls #73673 (fe64cafa33b5631da7fb911b1803da86407b0ebd; merge 6c2a3b4bb2f63b24539e28f5644aae0bb88e9b5c).
• tests/tui_gateway/test_change_watcher.py:55 verifies state.db changes emit sessions.changed, including trailing-edge preservation for coalesced writes.