Add read receipts

[bennycode]

Add read receipts to conversation messages in xmtp.chat

• Sends a read receipt via conversation.sendReadReceipt() when a conversation view mounts, after syncing.
• Adds a lastReadTimes map to the inbox store, updated by a new updateLastReadTimes action that fetches per-participant read timestamps from conversation.lastReadTimes().
• A new useReadStatus hook computes per-message read status ('sent' or 'read') based on other participants' last read times, and passes it to each Message in MessageList.
• Message headers display ✓ for sent and ✓✓ for read next to the timestamp in MessageContentWrapper.
• Incoming read receipt messages in streamAllMessages trigger a lastReadTimes update and are filtered out of the visible message list.

^{Macroscope summarized 1b50808.}

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Project	Deployment	Actions	Updated (UTC)
xmtp-js-xmtp-chat	Ready	Preview, Comment	Mar 5, 2026 0:13am

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
xmtp-chat-api-service	Skipped		Mar 5, 2026 0:13am

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Latest commit: 1b50808

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