Attach a response listener to the `/api/v2/chat` POST stream, parse its
SSE payloads, and reconstruct answer content/extra_info/communication
from the `multi_load/iframe` and `bar/iframe` messages. Expand embedded
`[(tab_container_N)]` references against the SSE cardMap so nested tab
content is inlined instead of leaking a raw placeholder. Prefer the API
answer, falling back to page state, and record `response_source` plus
`api_event_count` in the raw response for diagnosis.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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