docs: activity log — backend v2.8.69 + frontend v2.8.78 (chat system msgs + review)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

09 - Audits/Activity Log.md

@@ -1038,4 +1038,23 @@ handleVerify still refreshes after a successful confirm).
 
 ---
 
+### 2026-06-03 — backend v2.8.69 + frontend v2.8.78 — chat system messages + post-delivery review
+
+**Chat both-sides (round 2 — real root cause):** support welcome/greeting and
+group "chat created" messages are authored on the backend with
+`chat.metadata.createdBy` (the buyer) as senderId, so they rendered as the
+buyer's own. Backend (v2.8.69): `sendSystemMessage` now takes an optional
+senderId and createSupportChat passes the support user's id. Frontend (v2.8.78):
+any `messageType:'system'` message renders as a neutral centred note regardless
+of sender — robust fix for all system messages.
+**Post-delivery seller review (frontend v2.8.78):** buyer viewing a
+delivery/delivered/seller_paid/completed request sees a star + comment prompt
+(TelegramReviewPrompt). Seller resolved from the request's selected offer
+(getOffers → selectedOfferId → sellerId); submits createReview({subjectType:
+'seller', subjectId, rating, comment, purchaseRequestId}); 409 → "already
+reviewed" handled gracefully.
+**Verification:** backend + frontend tsc clean.
+
+---
+
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