fix: prevent page jump when clicking anchor links in editor

[arpiiitver]

Description

This PR fixes an issue where clicking an anchor link (e.g., href="#" or href="#section") inside the editor causes the page to scroll/jump unexpectedly.

Motivation

When a user tries to edit an existing anchor link, the browser's default behavior triggers a scroll event before the Link UI popover can be used effectively. This disrupts the editing flow and causes the user to lose their place in the document.

Fixes #72505.

Changes

• Updated packages/format-library/src/link/index.js to include event.preventDefault() in the handleClick handler.
• This ensures the editor intercepts the click event, preventing the browser's default navigation/scroll behavior while still opening the Link UI.

Testing Instructions

1. Create a new Post.
2. Add enough content to make the page scrollable.
3. Select text near the bottom and add a link with href="#".
4. Click the link text.
5. Verify that the Link UI popover opens without the page jumping to the top.

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[github-actions]

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