docs: use loading prop together with custom leading slot

[karladler]

Add note about loading icon using together with custom leading-slot, since it must be implemented within the slot.

🔗 Linked issue

Docs select-menu#loading

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)

📚 Description

Using loading prop together with a custom leading-slot will not show anything if not explicitly implemented there.
This is unexpected and should be fixed, as quick solution we add that to the docs for now.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: af287c86-90ac-4e7b-8ea8-29b91e987353

📥 Commits

Reviewing files that changed from the base of the PR and between f26855d and d522a74.

📒 Files selected for processing (1)

• docs/content/docs/2.components/select-menu.md

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📝 Walkthrough

Walkthrough

Added a short clarification to the select-menu documentation under the "Loading Icon" section: the loading icon is rendered inside the leading slot and will not appear if a custom leading slot is provided unless the custom slot includes the icon explicitly. No code or public API declarations were changed.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly describes the main change: documenting the interaction between the loading prop and custom leading slot in the select-menu component.
Description check	✅ Passed	The description is fully related to the changeset, explaining why the documentation note was added and the specific behavior being documented.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@docs/content/docs/2.components/select-menu.md`:
- Around line 666-668: Update the existing note block that begins with "::note"
which currently says "The loading icon is rendered within the `leading` slot.
Keep that in mind when using a custom leading slot." to a clearer warning:
explicitly state that if a consumer provides a custom `leading` slot the
component's built-in loading icon will not be displayed automatically and must
be rendered inside the custom slot if desired; reference the `leading` slot and
the loading icon so users know they must implement the loading indicator
themselves when overriding `leading`.

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ℹ️ Review info

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between fcdb231 and 219a06f.

📒 Files selected for processing (1)

• docs/content/docs/2.components/select-menu.md

[pkg-pr-new]

npm i https://pkg.pr.new/@nuxt/ui@6123

commit: e9a11b2