Navigation Link: Add showForLoggedInOnly attribute for visibility

[prasadkarmalkar]

What?

Closes #70605

Add a checkbox to show the navigation link to only logged in user.

Why?

Currently, there is no built-in way to add conditions to menus, such as displaying different menu items when a user is logged in or logged out.

How?

• Created a checkbox option in navigation-link and set a attribute
• While dynamically rendering menu check attribute and display only if its set and user is logged in

Testing Instructions

Testing Instructions for Keyboard

Screenshots or screencast

Screen.Recording.2025-07-09.at.1.12.30.PM.mov

Before	After

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[t-hamano]

@prasadkarmalkar Sorry for the late reply.

In fact, we are working on hiding blocks based on screen size, and we may implement additional functionality in the future to conditionally render blocks. See #72502 (comment) for more details.

Given that, it may not be desirable to implement certain conditional rendering functions on certain blocks.

I'd like to close this issue, but thank you for your efforts!