Improve repo button row layout (#30668) (#30839)

Improve repo button row layout (#30668) (#30839)

Backport #30668 by @silverwind

Since there is now a second `<input>` in the repo buttons, we can make a
better-looking layout with no empty space, except on mobile.

Also I fixed one bug with focus border on clone panel.

## Large

<img width="1163" alt="Screenshot 2024-04-23 at 22 25 22"
src="https://github.com/go-gitea/gitea/assets/115237/8135a572-aa67-4672-ad49-b76b06890b52">

## Medium
<img width="870" alt="Screenshot 2024-04-23 at 22 25 34"
src="https://github.com/go-gitea/gitea/assets/115237/9e93f61c-3315-4a78-8328-8cefad5b50fa">

## Mobile
<img width="416" alt="Screenshot 2024-04-23 at 22 25 52"
src="https://github.com/go-gitea/gitea/assets/115237/859e341f-807a-48e6-8bcf-31715963216c">

Co-authored-by: silverwind <me@silverwind.io>