[FIX] Minor bug fixes in MentionList and MentionNode UI (#2600)

* fix: removed text color in peek view

* fix: fixed list view UI bugs and node view colors

* feat: update imports in suggestions for mentionSuggestion type

* fix: updated mention list css

* fix: updated mention node UI according to the design provided

* style: update the mentions dropdown UI

* style: mentioned users UI in the editor

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Co-authored-by: Aaryan Khandelwal <aaryankhandu123@gmail.com>

web/components/issues/issue-peek-overview/issue-detail.tsx

@@ -140,7 +140,7 @@ export const PeekOverviewIssueDetails: FC<IPeekOverviewIssueDetails> = (props) =
       </div>
       <span>{errors.name ? errors.name.message : null}</span>
 
-      <span className="text-black">
+      <span className="">
         <RichTextEditor
           uploadFile={fileService.getUploadFileFunction(workspaceSlug)}
           deleteFile={fileService.deleteImage}