[ VSCode ] Apply light mode to Markdown previews only.

markdown-preview-light.css

/* Markdown プレビューを常にライト表示（エディタはダークのまま） */
body.vscode-dark,
body.vscode-light {
  background-color: #ffffff !important;
  color: #24292e !important;
}

body.vscode-dark pre,
body.vscode-dark code {
  background-color: #f6f8fa !important;
  color: #24292e !important;
  border: 1px solid #e1e4e8;
}

body.vscode-dark a {
  color: #0366d6 !important;
}

body.vscode-dark table th,
body.vscode-dark table td {
  border-color: #e1e4e8 !important;
}

body.vscode-dark blockquote {
  border-left-color: #dfe2e5 !important;
  color: #57606a;
}