feat(diff-panel): show total line additions and deletions - #4674

Bugbot Analysis Progress (2m 11s elapsed)

✅ Gathered PR context (4s)
✅ Completed bug detection (2m 6s)
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Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_26b92090-0b93-493c-9c1a-ea6469b744dc