Fix focusing on first context menu item

[myabc]

Ensure menu positioning is complete. Make focus take place after next repaint.

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Merge checklist

• Added/updated tests
• Added/updated documentation in Lookbook (patterns, previews, etc)
• Tested major browsers (Chrome, Firefox, Edge, ...)

[Copilot]

Pull Request Overview

This PR refactors the context menu opening flow to use promises and proper async handling instead of setTimeout. The changes improve timing control and prevent race conditions when menus are opened in rapid succession.

Key Changes

• Replaced setTimeout with promise-based async flow using requestAnimationFrame for better DOM/style synchronization
• Added sequence tracking (openSeq) to prevent race conditions when multiple menus are opened rapidly
• Made reposition() return a Promise<void> for proper async chaining

[Copilot]

Pull Request Overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 2 comments.

Comments suppressed due to low confidence (1)

frontend/src/app/shared/components/op-context-menu/op-context-menu.service.ts:156

• The reposition() method sets visibility: 'visible' on line 156, but the show() method also sets visibility: 'visible' on line 107. This creates redundant visibility toggling. Since show() now manages visibility explicitly, remove the visibility style from reposition() to avoid conflicts and maintain single responsibility.

          visibility: 'visible'