Editor: Incorrect Markdown formatting when pasting URL via 'Add a link' button

[MaxWebZ]

Description

When adding a hyperlink using the "Add a link" button in issue/comment editor, pasting a URL results in incorrect Markdown formatting (double brackets) instead of replacing the placeholder text.

Steps to reproduce

1. Type any text in the editor
2. Select a text to use as link text
3. Click the "Add a link" button on the toolbar
4. The editor formats the selection to: [Example text](url) (with "url" pre-selected)
5. Paste a URL from clipboard (Ctrl+V)

Expected behavior:
The result should be: [Example text](https://example.com)

Actual behavior:
The result is: [Example text]([url](https://example.com))

Browser

Google Chrome 137.0.7151.104

Gitea Version

1.24.0

Can you reproduce the bug on the Gitea demo site?

Yes

Log Gist

No response

Screenshots

Ctrl+V:

Git Version

No response

Operating System

Windows 10 Pro 64-bit

How are you running Gitea?

Docker

Database

None

[MaxWebZ]

I just noticed: if I select text and paste directly with Ctrl+V, it actually works fine. But for some reason, most users instinctively click the "Add a link" button first.