server : (webui) put DeepSeek R1 CoT in a collapsible <details> element (#11364)

server : (webui) put DeepSeek R1 CoT in a collapsible <details> element (#11364)

* webui : put DeepSeek R1 CoT in a collapsible <details> element

* webui: refactor split

* webui: don't use regex to split cot and response

* webui: format+qol

* webui: no loading icon if the model isn't generating

* ui fix, add configs

* add jsdoc types

* only filter </think> for assistant msg

* build

* update build

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Co-authored-by: Xuan Son Nguyen <redacted>