fix: add sm:pl-7 to ensure child indentation is visible on desktop

The base IssueRow has sm:pl-1 which overrides pl-6 at sm+ breakpoints.
Adding sm:pl-7 ensures the indent is visible at all screen sizes.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

ui/src/components/IssuesList.tsx

@@ -696,7 +696,7 @@ export function IssuesList({
                       <IssueRow
                         issue={issue}
                         issueLinkState={issueLinkState}
-                        className={isChild ? "pl-6" : undefined}
+                        className={isChild ? "pl-6 sm:pl-7" : undefined}
                         mobileLeading={
                           hasChildren ? (
                             <button type="button" onClick={toggleCollapse}>