The pulsing green dot next to a session row signals that the session
had activity in the last 10 minutes, but the meaning was undocumented.
Hovering it now shows a translated tooltip, and an aria-label exposes
the same text to screen readers.
Uses the existing shared Tooltip component (portal-positioned, so it
is not clipped by the sidebar overflow). Translation key added to all
eight sidebar locale files (en, de, it, ja, ko, ru, tr, zh-CN).
Add complete Italian (it) translations for all 7 namespaces:
common, auth, settings, sidebar, chat, codeEditor, and tasks.
Register Italian in languages.js and i18n config.
Add .gitignore exception for it/tasks.json.
Co-authored-by: Simos Mikelatos <simosmik@gmail.com>