fix: make credits help icon a tooltip button in cloud user popover (FE-617) (#12072)

## Summary

The help icon (lucide circle-help) next to the credits balance in the
cloud user popover was a bare `<i>` with `v-tooltip` and `cursor-help`.
PrimeVue tooltip on a bare `<i>` did not fire reliably and the icon had
no focus/keyboard semantics, so users saw "no hover action and not
clickable".

Wrap the icon in `<Button variant="muted-textonly" size="icon-sm">`,
matching the existing pattern in `InfoButton.vue` and
`MissingPackGroupRow.vue`. Same change applied to
`CurrentUserPopoverLegacy.vue` and `CurrentUserPopoverWorkspace.vue`,
which shared the broken pattern.

- Fixes FE-617
-
https://comfy-organization.slack.com/archives/C0A4XMHANP3/p1778191473621829

## Red-Green CI Verification

The branch was force-pushed back to the test-only commit so CI could run
against it, then restored to the fix commit.

| Commit | CI: Tests Unit | Outcome |
|--------|---------------|---------|
| `test:` (e7c83abd0) — adds the regression test only |
https://github.com/Comfy-Org/ComfyUI_frontend/actions/runs/25532935842 |
failed — `Unable to find an element by:
[data-testid="credits-info-button"]` |
| `fix:` (64ec4cda4) — wraps the icon in `<Button>` |
https://github.com/Comfy-Org/ComfyUI_frontend/actions/runs/25533224195 |
passed |



<img width="434" height="364" alt="Screenshot 2026-05-08 at 5 32 47 PM"
src="https://github.com/user-attachments/assets/d3088b90-813f-4a0f-ba35-0f040fc79a6a"
/>

## Test Plan

- [x] Component test asserts the icon renders as an interactive
`<button>` with the unified-credits tooltip text as `aria-label`
- [x] Red CI failed with the expected error on the test-only commit
- [x] Green CI passed on the fix commit
- [ ] Manual verification on `pnpm dev:cloud` — hover the help icon next
to the credits balance and confirm the unification tooltip appears

src/components/topbar/CurrentUserPopoverLegacy.test.ts

@@ -252,6 +252,20 @@ describe('CurrentUserPopoverLegacy', () => {
     expect(screen.getByText('Log Out')).toBeInTheDocument()
   })
 
+  describe('credits help icon (FE-617)', () => {
+    it('renders the credits help icon as an interactive button with the unified-credits tooltip as its accessible name', () => {
+      renderComponent()
+
+      const helpButton = screen.getByTestId('credits-info-button')
+      expect(helpButton).toBeInTheDocument()
+      expect(helpButton.tagName).toBe('BUTTON')
+      expect(helpButton).toHaveAttribute(
+        'aria-label',
+        enMessages.credits.unified.tooltip
+      )
+    })
+  })
+
   it('opens user settings and emits close event when settings item is clicked', async () => {
     const { user, onClose } = renderComponent()
 

src/components/topbar/CurrentUserPopoverLegacy.vue

@@ -41,10 +41,16 @@
       <span v-else class="text-base font-semibold text-base-foreground">{{
         formattedBalance
       }}</span>
-      <i
+      <Button
         v-tooltip="{ value: $t('credits.unified.tooltip'), showDelay: 300 }"
-        class="mr-auto icon-[lucide--circle-help] cursor-help text-base text-muted-foreground"
-      />
+        variant="muted-textonly"
+        size="icon-sm"
+        class="mr-auto"
+        :aria-label="$t('credits.unified.tooltip')"
+        data-testid="credits-info-button"
+      >
+        <i class="icon-[lucide--circle-help]" />
+      </Button>
       <Button
         v-if="isCloud && isFreeTier"
         variant="gradient"

src/platform/workspace/components/CurrentUserPopoverWorkspace.vue

@@ -68,10 +68,16 @@
       <span v-else class="text-base font-semibold text-base-foreground">{{
         displayedCredits
       }}</span>
-      <i
+      <Button
         v-tooltip="{ value: $t('credits.unified.tooltip'), showDelay: 300 }"
-        class="mr-auto icon-[lucide--circle-help] cursor-help text-base text-muted-foreground"
-      />
+        variant="muted-textonly"
+        size="icon-sm"
+        class="mr-auto"
+        :aria-label="$t('credits.unified.tooltip')"
+        data-testid="credits-info-button"
+      >
+        <i class="icon-[lucide--circle-help]" />
+      </Button>
       <!-- Upgrade to add credits (free tier) -->
       <Button
         v-if="isActiveSubscription && permissions.canTopUp && isFreeTier"