- Add Linear import (GraphQL, personal API key, optional team key filter).
- Centralize integration HTTP via integration_session and session_request.
- Add integration_sync_context for project/task refs and custom_fields metadata.
- Refactor Asana, GitHub, GitLab, Jira, Trello, ActivityWatch, and QuickBooks to use helpers.
- Extend integration UI, settings, and scheduled sync behavior as needed.