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Live agent activity and lighter viewer fallback.
- Show Working/Still working indicators while an agent turn is running, including collapsed thinking/tool groups.
- Add a pending-assistant placeholder and a Tool-only response note for completed tool-only turns.
- Add skeleton loading for on-demand thinking/tool details and the New messages button.
- Add a lightweight /api/public/shares/:id/status endpoint and replace the 15s full-page poll with status checks plus a WebSocket watchdog.
- Service API version is now 3; plugin is 0.3.0. Upgrade the service and plugin together.