amyboardweb: reduce sysex delay and fix tar_extract truncation

[bwhitman]

Summary

• reduce amyboardweb sysex inter-transfer pacing from 100ms to 25ms
• fix tulip.tar_extract to stream file data instead of single-read

Why

• sysex transfer pacing was intentionally tuned and is now lowered
• large files extracted from tar were truncated at 65536 bytes because utarfile.FileSection.read() defaults to 64KiB when called once without size

Validation

• verified source locations and logic:
  • tulip/amyboardweb/static/spss.js sysex pacing now uses sleep_ms(25)
  • tulip/shared/py/tulip.py extraction now loops until EOF via sub_file.read(4096)