fix: live transfer speed, receiver cancel, and sender/receiver byte-c…

[Aswanidev-vs]

…ount alignment

• Speed now tracks bytes per recent window (rateTracker) instead of a lifetime average that only declines, in all three progress paths: sender, single-stream receiver, and segmented assembly
• Cancelling on the receiving device aborts inbound streams within one chunk (cancellationReader), deletes the partial file, marks every file in the batch cancelled, and answers 499; segmented transfers share one cancel flag across parallel segments
• The sender probes the peer's /api/status after an upload error and finalizes as cancelled (not a generic failure) when the peer cancelled, so both UIs agree; queued files stop too
• TCP kernel buffers capped at 1 MiB (was 8 MiB) so the sender's buffered-bytes lead over the receiver shrinks from ~30 MB to a few MB; QUIC keeps its large UDP buffers via a separate control
• 4 new regression tests: rolling rate vs lifetime average, cancellation reader, mid-stream inbound cancel, sender peer-cancel classification

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[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 35 complexity · 18 duplication

Metric	Results
Complexity	35
Duplication	18

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