fix(vscode): compute source offsets correctly

[KazariEX]

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[KermanX]

We made the same fix at the same time😂

[pkg-pr-new]

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@slidev/client

npm i https://pkg.pr.new/slidevjs/slidev/@slidev/client@1963

create-slidev

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@slidev/parser

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create-slidev-theme

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@slidev/cli

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@slidev/types

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commit: 562419d