fix(Dashboard): 添加错误处理，统一DateTime使用

wanshenmean

2026-03-30 6af451b3d95627b745da9a9e334419b1b5d4ee4f

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{"t":0,"agent":"a1dd170","agent_type":"unknown","event":"agent_stop","success":true}
{"t":0,"agent":"a5ca246","agent_type":"unknown","event":"agent_stop","success":true}