fix: overlay parent action modal reopening

[VernSG]

Change-Id: Ie412d8ad1f279c124de3fc83ef01d7aad4ec4c70

Description

Fixes #19561.

This prevents an action modal from briefly reopening when overlayParentActions() is used and nested modals are dismissed quickly.

When the child modal is closed, Livewire still needs to process the unmount request. If the parent modal is closed locally before that first request finishes, the next Livewire sync can still report the parent action as mounted and reopen the parent modal for a moment.

This keeps the optimistic UI behavior, but tracks action modal nesting indexes that have already been dismissed locally. When Livewire syncs back to an already-dismissed action index, the client skips reopening it.

Related to #19565. That PR also guarded against reopening dismissed modals, but reopening a child modal after closing it required two attempts. This version prunes dismissed child nesting indexes when Livewire syncs back to a parent action, so a child modal can still be reopened on the first attempt.

Visual changes

Recording with Chrome DevTools network throttling set to Slow 4G:

filament-modal-reopening-upload.mp4

Functional changes

• Code style has been fixed by running the composer cs command.
• Changes have been tested to not break existing functionality.
• Documentation is up-to-date.

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