fix: prevent builds dialog from closing when using dropdown menu

[willeastcott]

Summary

• Migrated the builds dropdown from LegacyMenu to PCUI Menu, so the project overlay's existing .pcui-menu pointerdown guard recognizes it and no longer dismisses the builds dialog when the dropdown is open
• Added a guard in the project overlay to prevent it from closing when clicking on a different overlay (e.g. the delete confirmation dialog)
• Added CSS to hide the empty submenu children container on hover for leaf menu items in both the builds and scene dropdown menus

Fixes #1969

[vercel]

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Project	Deployment	Actions	Updated (UTC)
editor	Ready	Preview, Comment	Mar 20, 2026 3:18pm

[Copilot]

Pull request overview

This PR addresses a UI regression where interacting with the builds dropdown / delete confirmation could unintentionally dismiss the “Project” builds dialog, by aligning the builds dropdown with existing PCUI overlay/menu click-guard behavior and tightening overlay dismissal rules.

Changes:

• Migrates the builds “…” dropdown from LegacyMenu to PCUI Menu so it is recognized by the existing .pcui-menu pointerdown guard.
• Updates the project overlay pointerdown handling to avoid closing when the user clicks inside a different overlay (e.g. confirmation modal).
• Adds SCSS rules to hide the empty submenu children container on hover for leaf menu items in the builds and scene dropdown menus.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/editor/pickers/picker-project.ts	Prevents the project overlay from closing when pointer events originate from a different .pcui-overlay.
src/editor/pickers/picker-builds-publish.ts	Replaces LegacyMenu with PCUI Menu for the builds dropdown, using hidden/show/hide semantics consistent with other PCUI menus.
sass/editor/_editor-main.scss	Adds menu styling to hide empty submenu containers for leaf items in builds/scene menus.

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