fix(ui): prevent dark mode from mutating host document

[SaKaNa-Y]

Description

Close #479

Linked Issues

Additional context

[pkg-pr-new]

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@vitejs/devtools

npm i https://pkg.pr.new/@vitejs/devtools@480

@vitejs/devtools-kit

npm i https://pkg.pr.new/@vitejs/devtools-kit@480

@vitejs/devtools-oxc

npm i https://pkg.pr.new/@vitejs/devtools-oxc@480

@vitejs/devtools-rolldown

npm i https://pkg.pr.new/@vitejs/devtools-rolldown@480

@vitejs/devtools-vite

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@vitejs/devtools-vitest

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commit: adf67f1

[SaKaNa-Y]

For #479, only modifying ViteDevTools.vue is enough to fix the reported issue. The changes in the other files are a further refactor of the dark mode composable, intended to prevent other components from encountering the same issue.