DSH Web session timeline organization

Key features

• Automatic foldingCompleted rounds automatically fold away thinking, tool calls, and intermediate text, leaving only the final summary
• Automatically fold completed rounds: Hide thoughts, tool calls and intermediate text, only retain the final conclusion, and the control bar contains the processing time.
• Folding/separation/navigation are all located through DOM structure anchors (contract-level attributes such as data-chat-anchor-key, data-variant="think", etc.) and do not rely on compile-time hash class names
• The control bar contains "process N steps" and processing time (time/first token/rate)