fix(stage-ui): combobox z-order

[s3d-i]

Description

ComboboxContent using z-150 while the dialog overlay/content run at z-9999, so the picker was rendered underneath and unclickable.

[gemini-code-assist]

Summary of Changes

Hello @s3d-i, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves a critical UI layering issue where combobox dropdowns were incorrectly rendered beneath modal dialogs, making them inaccessible. The fix involves elevating the z-index of the combobox's portal content to a sufficiently high value, guaranteeing its visibility and interactivity when used in conjunction with other overlaying UI components.

Highlights

• Z-Index Adjustment: Introduced a new constant COMBOBOX_PORTAL_Z with a high z-index value (z-[12000]) to ensure the combobox content renders above modal overlays.
• Combobox Content Styling: Replaced the previous z-150 class on the combobox content with the new COMBOBOX_PORTAL_Z constant, resolving the layering issue.

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[github-actions]

⏳ Approval required for deploying to Cloudflare Workers (Preview) for stage-web.

Name	Link
🔭 Waiting for approval	For maintainers, approve here

Hey, @nekomeowww, @sumimakito, @luoling8192, @LemonNekoGH, kindly take some time to review and approve this deployment when you are available. Thank you! 🙏

[gemini-code-assist]

Code Review

This pull request effectively resolves the z-order issue for the combobox by introducing a higher z-index value. The change improves maintainability by extracting the z-index into a named constant and provides a clear comment explaining the rationale.