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4aa8d7e0b5
feat: chat interactivity overhaul — read receipts, polling, sound, unread, icons
- Read receipts: MarkSenderMessagesReadCrossConv matches by body across conversations
- Anti-fraud: cross-domain read receipts require SHA-256 body proof
- Real-time polling: 5s interval refreshes threads + active thread messages
- Notification sound: Web Audio API beep on new unread messages
- Unread indicator: conv.Unread=true on inbound message delivery
- Double-check icon: custom SVG in web_src/svg/ (survives make svg)
- SMTP icon: octicon-mail for email-delivered messages
- Delivery status: same-domain=M8SH check, external=SMTP mail icon, failed=cross
- Plain mode: global toggle for mobile text selection
- Desktop email layout: no width stripping, mobile-only shrinking
- Registration allowlist: domestic users require admin approval
Assisted-By: Cline:anthropic-claude-sonnet-4-20250514