Support streaming delta.reasoning_content in WebUI #15052
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When llama-server sends reasoning content in
choices[0].delta.reasoning_contentadd that content within<think>...</think>tags.Additionally fixes issue with Qwen3 thinking models that do not send a tag by default.
Ref: Addresses feedback from @ngxson in #14997 (comment) by using
Message.contentinstead of introducing a newreasoningContent?: string.