docs: add message send queue to high priority TODO
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| 1 | 1 | # PAILot Flutter - TODO |
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| 2 | 2 | |
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| 3 | +## High Priority |
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| 4 | + |
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| 5 | +### Message Send Queue (reliability) |
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| 6 | +- Queue outgoing messages locally until WebSocket confirms delivery |
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| 7 | +- Retry on reconnect — messages sent during disconnection/restart aren't lost |
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| 8 | +- Visual indicator on messages: sending → sent (currently fire-and-forget) |
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| 9 | +- Daemon restart drops in-flight messages — need client-side persistence |
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| 10 | + |
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| 3 | 11 | ## Pending Features |
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| 4 | 12 | |
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| 5 | 13 | ### File Transfer (send/receive arbitrary files) |
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