Honor the VSCode theme for dialog backgrounds

[cte]

Description

https://www.loom.com/share/716d1895488a44d1b69a3bbc800e462d?sid=43f72e36-9475-4eda-81ea-5a589b3b9c6d

Fixes #948

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Checklist:

• My code follows the patterns of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

Additional context

Related Issues

Reviewers

---

Important

Change dialog background in dialog.tsx to match VSCode theme.

• UI Update:
  • In dialog.tsx, change dialog background class from bg-background to bg-vscode-editor-background to match VSCode theme.

^{This description was created by for 0b8fd14. It will automatically update as commits are pushed.}

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Latest commit: 0b8fd14

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[cte]

Will eventually add all UI components to Storybook with a theme picker so we can verify that we're respecting themes.