Fix issue and commit status popup padding (#25254) (#25288)

Backport #25254 by @wxiaoguang

Close #25249

Use "dialog" for the role



![image](https://github.com/go-gitea/gitea/assets/2114189/2b5b7552-48bc-4ecf-947b-34917232cff9)

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

web_src/js/features/contextpopup.js

@@ -34,6 +34,7 @@ export function attachRefIssueContextPopup(refIssues) {
       content: el,
       placement: 'top-start',
       interactive: true,
+      role: 'dialog',
       interactiveBorder: 5,
       onShow: () => {
         el.firstChild.dispatchEvent(new CustomEvent('ce-load-context-popup', {detail: {owner, repo, index}}));