List view: decoded summaries for ATR/PPS/RST/VCC instead of raw hex

- decode.py: decode_sniff_msg builds list summaries — ATR: protocol(s),
  TA1 F/D + ratio, T=15 classes, data rate (when a CLK rate was known);
  PPS: protocol + F/D + ratio; RST: 'CLK x.xxx MHz' when the event
  carried a rate
- index.html: cmd_description returns summary || '' for these types and
  STATUS, never falling back to opaque bytes like 010100
- tests: ATR (plain/TA1/classes+rate/unparsed), PPS, RST CLK/no-CLK, VCC
- Bump 1.22.20, SW cache v51->v52

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.backends._legacy:_Backend"
 
 [project]
 name = "simtrace2-pysniff"
-version = "1.22.19"
+version = "1.22.20"
 description = "Python-based sniffing tool for SIMtrace2 hardware (SIM card communication sniffer)"
 readme = {file = "README.md", content-type = "text/markdown"}
 license = {text = "GPL-2.0-or-later"}