fix(desktop): don't gate hover-reveal on the hover media query

Tailwind v4 wraps hover:/group-hover: in @media (hover: hover). Windows
hosts with a digitizer often answer false even with a mouse, so those
controls stay opacity-0 — clickable, invisible. Trust :hover itself.

Co-authored-by: xxxigm <54813621+xxxigm@users.noreply.github.com>

apps/desktop/src/hover-variant.test.ts

@@ -0,0 +1,40 @@
+// @vitest-environment node
+import { dirname } from 'node:path'
+import { fileURLToPath } from 'node:url'
+
+import { compile } from '@tailwindcss/node'
+import { describe, expect, it } from 'vitest'
+
+const SRC = dirname(fileURLToPath(import.meta.url))
+
+const CANDIDATES = ['hover:opacity-100', 'group-hover/attachment:opacity-100', 'group-hover/code:opacity-100']
+
+async function utilitiesFor(css: string): Promise<string> {
+  const { build } = await compile(css, { base: SRC, onDependency() {} })
+  const out = build(CANDIDATES)
+  const start = out.indexOf('@layer utilities {')
+  expect(start).toBeGreaterThanOrEqual(0)
+  return out.slice(start)
+}
+
+function gatesHoverOnCapabilityQuery(css: string): boolean {
+  return /@media\s*\(\s*hover\s*:\s*hover\s*\)/.test(css)
+}
+
+describe('hover variant (Windows hover-reveal)', () => {
+  it('still wraps hover utilities in the capability query without an override', async () => {
+    const utilities = await utilitiesFor('@import "tailwindcss";\n')
+
+    expect(utilities).toContain('group-hover')
+    expect(gatesHoverOnCapabilityQuery(utilities)).toBe(true)
+  })
+
+  it('does not wrap the app stylesheet hover utilities in the capability query', async () => {
+    const utilities = await utilitiesFor('@import "./styles.css";\n')
+
+    expect(utilities).toContain('.group-hover\\/attachment\\:opacity-100')
+    expect(utilities).toContain('.group-hover\\/code\\:opacity-100')
+    expect(utilities).toContain('.hover\\:opacity-100')
+    expect(gatesHoverOnCapabilityQuery(utilities)).toBe(false)
+  })
+})

apps/desktop/src/styles.css

@@ -10,6 +10,10 @@
   font-size: var(--titlebar-icon-size);
 }
 
+/* v4 gates hover: on @media (hover: hover). Some Windows hosts with a
+   digitizer answer false even with a mouse, so hover-reveal controls stay
+   opacity-0 (clickable, invisible). Trust :hover itself. */
+@custom-variant hover (&:hover);
 @custom-variant dark (&:is(.dark *));
 
 /* Blanket reduced-motion override: kill ALL CSS animations and transitions