5bc59376f5659046c4112a23b73348720ca44265
- ChatLine gains sender_fp field for tracking who sent each message - App gains read_receipts_sent HashSet to avoid duplicate receipts - After each draw(), visible received messages get a Read receipt sent - Only fires once per message_id, skips system/self messages - Sender sees blue ✓✓ (existing display logic already handles Read) - All ChatLine literals across 6 files updated with sender_fp field Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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