fix: dedupe @unocss/core and match minified inline viewer style

The deps bump to unocss 66.10.2 left @antfu/design's optional
@unocss/core peer resolving to a stale 66.10.0, so the two copies of
its types made presetAnthonyDesign() unassignable in design/uno.config.ts
and broke every example typecheck. Pin @unocss/core to the unocss
override so one copy resolves.

Vite 8.3 also minifies the standalone viewer's inline <style>, so the
hub-ui background test now matches the CSS with whitespace stripped
instead of its authored spacing.

Author: antfubot

packages/hub-ui/src/index.test.ts

@@ -13,13 +13,16 @@ describe('createUi branding background', () => {
     expect.assertions(6)
 
     const html = readFileSync(fileURLToPath(new URL('../dist/client/standalone/index.html', import.meta.url)), 'utf8')
+    // The build minifies the inline <style>, so match against the CSS with all
+    // whitespace stripped rather than its authored spacing.
+    const css = html.replace(/\s+/g, '')
 
     expect(html).not.toContain('__hub-ui.css')
-    expect(html).toContain('color-scheme: light')
-    expect(html).toContain('--devframes-viewer-background: #fff')
-    expect(html).toContain('--devframes-viewer-background: #111')
-    expect(html).toContain('background: var(--devframes-viewer-background)')
-    expect(html).not.toMatch(/html\.viewer-background-custom\s*\{[^}]*color-scheme:\s*normal/)
+    expect(css).toContain('color-scheme:light')
+    expect(css).toContain('--devframes-viewer-background:#fff')
+    expect(css).toContain('--devframes-viewer-background:#111')
+    expect(css).toContain('background:var(--devframes-viewer-background)')
+    expect(css).not.toMatch(/html\.viewer-background-custom\{[^}]*color-scheme:normal/)
   })
 
   it('preserves the default viewer background', () => {