Add shadcn/ui + Storybook

[cte]

Description

Now that we have Tailwind, let's add shadcn/ui as our component library and set up Storybook so we can start building out re-usable components for our webview. Using shadcn will allow us to utilize v0.dev.

Demo

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

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Important

Integrate shadcn/ui and set up Storybook for component development in the webview-ui project.

• New Features:
  • Integrate shadcn/ui component library for reusable UI components.
  • Set up Storybook in webview-ui/.storybook for component development and testing.
• Configuration Changes:
  • Add Storybook configuration files: main.ts, preview.ts, and vscode.css.
  • Update package.json scripts to include Storybook commands.
  • Modify vite.config.ts for Vite server settings and build output.
• Code Changes:
  • Add button.tsx in src/components/ui for button component with variants.
  • Update ChatRow.tsx to use new UI components and styles.
  • Add utility function cn in src/lib/utils.ts for class name merging.
• Miscellaneous:
  • Update .gitignore to exclude Storybook logs.
  • Remove unused files from public directory.
  • Update README.md with new development instructions.

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[cte]

This is the default button generated by the shadcn cli. We'll need to make it look more like the native VSCode UI (similar to https://github.com/estruyf/vscrui).

[cte]

Not sure which of these are actually needed; this was auto-generated by Storybook.

[cte]

CC @samhvw8 - When we added Tailwind some of the webview UI looked strange b/c Tailwind removes a lot of default styling via their preflight mechanism. I disabled it for now per https://tailwindcss.com/docs/preflight#disabling-preflight.