fix(desktop): keep attachment close and code copy icons visible (#95611)

* fix(desktop): keep attachment close and code copy icons visible

Hover-only opacity-0 hid the composer remove control and code-block copy button, so they stayed clickable but invisible on Windows and other no-hover surfaces.

* test(desktop): pin attachment close and code copy visibility at rest

The remove chip and code-block copy control must stay in the tree without a hover class, so Windows and no-hover surfaces cannot hide them again.

apps/desktop/src/app/chat/composer/attachments.test.tsx

@@ -236,6 +236,18 @@ describe('AttachmentList', () => {
     )
   })
 
+  it('shows the remove control at rest and does not hide it behind hover', async () => {
+    const onRemove = vi.fn()
+
+    await renderWithI18n(<AttachmentList attachments={[makeAttachment('a', 'doc.pdf')]} onRemove={onRemove} />)
+
+    const remove = screen.getByRole('button', { name: 'Remove doc.pdf' })
+
+    expect(remove.className.split(/\s+/)).not.toContain('opacity-0')
+    fireEvent.click(remove)
+    expect(onRemove).toHaveBeenCalledWith('a')
+  })
+
   it('still routes a non-image attachment to the preview rail', async () => {
     $previewTabs.set([])
 

apps/desktop/src/app/chat/composer/attachments.tsx

@@ -149,7 +149,7 @@ function AttachmentPill({ attachment, onRemove }: { attachment: ComposerAttachme
   return (
     <>
       <Tip label={attachment.path || attachment.detail || attachment.label}>
-        <div className="group/attachment relative min-w-0 shrink-0">
+        <div className="relative min-w-0 shrink-0">
           <button
             aria-busy={isUploading || undefined}
             aria-label={canPreview ? c.previewLabel(attachment.label) : attachment.label}
@@ -204,11 +204,11 @@ function AttachmentPill({ attachment, onRemove }: { attachment: ComposerAttachme
           {onRemove && (
             <button
               aria-label={c.removeAttachment(attachment.label)}
-              className="absolute -right-1 -top-1 grid size-3.5 place-items-center rounded-full border border-border/70 bg-background text-muted-foreground opacity-0 shadow-xs transition hover:bg-accent hover:text-foreground group-hover/attachment:opacity-100 focus-visible:opacity-100"
+              className="absolute -right-1 -top-1 z-10 grid size-4 place-items-center rounded-full border border-border/70 bg-background text-muted-foreground shadow-xs transition hover:bg-accent hover:text-foreground"
               onClick={() => onRemove(attachment.id)}
               type="button"
             >
-              <Codicon name="close" size="0.625rem" />
+              <Codicon name="close" size="0.7rem" />
             </button>
           )}
         </div>

apps/desktop/src/components/assistant-ui/markdown-text.artifacts.test.tsx

@@ -65,6 +65,14 @@ describe('MarkdownTextContent artifacts', () => {
     expect(artifactsForSession('session-artifacts')).toHaveLength(0)
   })
 
+  it('keeps the code-block copy control visible without hover', async () => {
+    render(<MarkdownTextContent isRunning={false} text={fenced('js', SMALL_SNIPPET)} />)
+
+    const copy = await screen.findByRole('button', { name: 'Copy code' })
+
+    expect(copy.className.split(/\s+/)).not.toContain('opacity-0')
+  })
+
   it('does not register while the message is still streaming', async () => {
     render(<MarkdownTextContent isRunning text={fenced('html', HTML_DOC)} />)
 

apps/desktop/src/components/chat/shiki-highlighter.tsx

@@ -15,7 +15,8 @@ import { isLikelyProseCodeBlock } from '@/lib/markdown-code'
  * own the wrapping `<CodeCard>` here and neutralize the upstream
  * `data-streamdown="code-block"` chrome from styles.css. The card is
  * background-only — no header row, no language label — so a fence reads as a
- * tinted slab of the reply; copy is a hover-reveal control in the corner.
+ * tinted slab of the reply. Copy stays visible in the corner (not hover-only)
+ * so Windows / touch / no-hover surfaces can still find it.
  *
  * `react-shiki` full bundle so all `bundledLanguages` work; theme switches
  * follow the document `color-scheme` via `defaultColor="light-dark()"`.
@@ -148,7 +149,7 @@ export const SyntaxHighlighter: FC<HermesSyntaxHighlighterProps> = ({
     <CodeCard data-streaming={defer ? 'true' : undefined}>
       <CopyButton
         appearance="inline"
-        className="absolute right-1.5 top-1.5 z-10 h-5 gap-0 rounded-md px-1 opacity-0 transition-opacity group-hover/code:opacity-100 focus-visible:opacity-100"
+        className="absolute right-1.5 top-1.5 z-10 h-5 gap-0 rounded-md bg-(--ui-bg-editor)/90 px-1"
         iconClassName="size-2.5"
         label={t.assistant.tool.copyCode}
         showLabel={false}