fix(dialog): correct z-index hierarchy for modals, popups, and context menus

[Copilot]

Fix z

Original prompt

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This section details on the original issue you should resolve

<issue_title>[BUG] Popup animation container has a higher z-index than Dialog overlay</issue_title>
<issue_description>## Bug Description

When a component with an opened popup is rendered on the page and a Dialog gets opened, the popup appears above the Dialog's overlay.

Steps to Reproduce

Steps to reproduce the behavior:

1. Open the following StackBlitz example - https://stackblitz.com/edit/angular-twtmmlsp-9n6ae68y
2. Click the "Open dialog" button.

Expected Behavior

The popup should not appear above the Dialog's overlay.

Actual Behavior

The k-animation-container element has a higher z-index than the Dialog's overlay, which makes it appear above the overlay.

Screenshots/Videos

Environment Information

Affected Theme(s)

• All themes

Affected Component(s)

Dialog component and components that open a popup (e.g., SplitButton, DropDownList, etc.).

Affected Suites

• Kendo UI for Angular
• Kendo UI for React</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [BUG] Popup animation container has a higher z-index than Dialog overlay #5658

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[github-actions]

Packages Report

	core	default	classic	bootstrap	material	fluent	utils	html
Size	29.20 KB (0.0%)	769.42 KB (0.0%)	768.12 KB (0.0%)	782.98 KB (0.0%)	916.14 KB (0.0%)	1181.71 KB (0.0%)	625.19 KB (0.0%)	77.78 MB (0.0%)
Gzip Size	4.85 KB (0.0%)	99.40 KB (0.0%)	99.64 KB (0.0%)	101.38 KB (0.0%)	112.33 KB (0.0%)	136.81 KB (0.0%)	52.16 KB (0.0%)	15.95 MB (0.0%)
Compile Time	0.7 s (-22.2%🔽)	3.1 s (0.0%)	3.1 s (0.0%)	3.3 s (0.0%)	3.2 s (0.0%)	3.7 s (0.0%)	2.8 s (0.0%)	8.4 s (0.0%)

[Juveniel]

@copilot do not add the /tests folder to .gitignore

[Copilot]

@copilot do not add the /tests folder to .gitignore

Reverted the .gitignore change in commit aea0e10. The tests/ directory is no longer excluded from version control.

[Juveniel]

@copilot the generated visual tests show an issue with the ContextMenu that is now not visible over a Window component. Investigate.

[Copilot]

@copilot the generated visual tests show an issue with the ContextMenu that is now not visible over a Window component. Investigate.

Fixed in commit 7ddc959. Changed ContextMenu popup z-index from k-z-index("popup") (11500) to k-z-index("modal", 1) (12001), ensuring it appears above Windows (12000) and Dialogs (12000).

Z-index hierarchy after fix:

• ContextMenu popup: 12001 (modal + 1) ✓
• Window/Dialog: 12000 (modal layer)
• Regular popups: 11500 (popup layer)