Render a breathing dots pulse (·‥…‥) in place of a hidden thinking block while the model is actively reasoning, so streaming progress is visible with hideThinkingBlock enabled. The pulse shows only while the block is live (not finalized), thinking is hidden, no tool call has started, and the tail block is thinking; it yields to streamed text and is removed when the block is sealed.
- Dropped blank lines, capped at 8 lines, and width-truncated each line so a proxy 502's HTML body can't flood the transcript.
- Mirrored the pinned error banner's preview behavior; full text still kept in the persisted session.
can1357