[新需求]: Support Dark and Light themes switch

新需求提供了什么功能？

Previewer should support system theme switch from light to dark mode so that developer can review application UI in different scenarios

该需求带来的价值、应用场景？

Help application developers and simplify UI development process

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OpenHarmony / ide_previewer

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新需求提供了什么功能？

该需求带来的价值、应用场景？

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OpenHarmony / ide_previewer .gitee-modal { width: 500px !important; }

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