fix(vscode): recognize dark high-contrast themes

[saime428]

Related Issue

Resolve #2158

Problem

The VS Code webview only treated vscode-dark as a dark theme, so dark high-contrast themes rendered using the light UI theme.

What changed

Treat vscode-high-contrast as dark while explicitly keeping vscode-high-contrast-light light. VS Code adds the generic high-contrast class to light high-contrast themes for backward compatibility.

Validation

• pnpm -C apps/vscode run typecheck
• pnpm -C apps/vscode run build:webview
• Verified dark, dark high contrast, light, and light high contrast class combinations
• pnpm -C apps/vscode run test — 293 passed; 3 unrelated Windows path tests failed

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue.
• I have added tests that prove my feature works.
• Ran gen-changesets; this private VS Code package change needs no changeset.
• No documentation update is required.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 43cb8a3

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