fix(vscode): support high-contrast dark theme

[junyu33]

Fix VS Code dark theme detection for high-contrast dark themes.

The webview previously only treated vscode-dark as dark. VS Code uses vscode-high-contrast for dark high-contrast themes, causing Kimi Code to render with the light theme.

This change also treats vscode-high-contrast as dark while leaving vscode-high-contrast-light unchanged.

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