Keep desktop messaging sessions fresh

[lawyer112]

Summary

• poll messaging-platform session lists while the desktop is connected and visible so background gateway traffic appears in the sidebar
• refresh the currently open messaging-platform transcript from SessionDB on a short interval
• include message metadata in the session row signature so updated previews, counts, and activity times are not ignored

Testing

• npm run typecheck (apps/desktop)
• npx eslint src/app/desktop-controller.tsx
• git diff --check

Manual verification

• Confirmed WeChat messages are already persisted in the local SessionDB; the desktop UI was stale because external platform sessions are not driven by the local chat websocket events.
• Rebuilt and hot-patched the local macOS desktop bundle for immediate testing.

[lawyer112]

Added a backend follow-up fix for the same desktop/messaging sync issue.

Root cause found in dogfood: a platform SessionStore entry can remain pinned to a pre-compression parent session after a restart/send failure, while desktop opens the compression continuation. That makes Weixin and desktop appear unsynced even when the desktop polling fix is present.

This update makes SessionStore heal existing mappings by walking SessionDB.get_compression_tip() before returning an entry, so platform messages resume the latest continuation.

Validation:

• uv run --with pytest --with pytest-timeout pytest tests/gateway/test_restart_resume_pending.py::TestGetOrCreateResumePending -q
• uv run --with ruff ruff check gateway/session.py tests/gateway/test_restart_resume_pending.py
• git diff --check

[tonydwb]

Code Review Summary

Verdict: Approved

Feature

• Desktop app now polls messaging-platform sessions in the background so inbound Telegram/Discord/WeChat traffic appears without manual refresh.
• CRON poll at 30s interval, messaging poll at 10s, active messaging session at 5s.

Correctness

• sameCronSignature now compares more fields (_lineage_root_id, source, profile, preview, message_count, last_active) to detect relevant changes without spurious re-renders.
• gateway/session.py additions support the polling backend.

Code Quality

• Proper use of useCallback / React patterns for polling cleanup.

No Issues Found

• No secrets, no debug artifacts.

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Reviewed by Hermes Agent

[OutThisLife]

Superseded by #57636.

The desktop refactor since this PR was authored extracted refreshMessagingSessions, $messagingSessions, and the related session infrastructure into a separate hook (use-session-list-actions.ts) and sameCronSignature into desktop-controller-utils.ts, so the original diff no longer applies cleanly. The supersede ports all three pieces (messaging list poll, active transcript poll, and gateway compression-tip healing) to current main with the necessary adaptations:

• refreshMessagingSessions is now exported from useSessionListActions instead of being defined inline in the controller
• The helpers (sessionMatchesStoredId, sessionMessagesSignature) and poll constants live in desktop-controller.tsx where the effects run
• sameCronSignature extension lands in desktop-controller-utils.ts where it was already extracted
• The Python test uses patch.object(store, '_compression_tip_for_session_id', ...) instead of replacing store._db with a bare MagicMock() — required because _is_session_ended_in_db was added to get_or_create_session on main after this PR was authored and a bare mock turns it truthy

Full credit preserved via Co-authored-by trailer. Thanks @lawyer112!