fix(example): add missing Tailwind import to shared ui styles (#10579)
This PR fixes
[vercel/turborepo#10566](https://github.com/vercel/turborepo/issues/10566)
by adding the missing Tailwind import to `shared-styles.css` in the
`packages/ui` directory of the `with-tailwind` example.
### What was the problem?
Shared components like `Card` or `Button` had Tailwind classes, but
styles were not applied because Tailwind layers were never included.
### What changed?
Added:
```css
@import "tailwindcss";
```
to packages/ui/shared-styles.css.
### Result
Tested locally using:
```
pnpm install
pnpm dev --filter=with-tailwind
```
UI components are now styled correctly.
Closes #10566
turborepo
e2bf0b03 - fix(example): add missing Tailwind import to shared ui styles (#10579)
