Show absolute wall-clock time in the APDU detail heading

Next to the relative elapsed time, the detail-view header now shows
the absolute local time (YYYY-MM-DD HH:MM:SS.mmm) computed as
session start + message elapsed offset.

- STATE.sessionStarted populated from /api/capture/start (live
  capture), data.session.started (session view), and PCAP imports
  (sessions.started already derives from the first packet timestamp
  when real).
- Graceful fallback to relative-only when the session start is
  unknown; applies to all detail header variants (gap, no-decoded,
  state change, Fi/Di, ATR/PPS, APDU).

Version 1.17.0, SW cache simtrace-analyser-v24.

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.backends._legacy:_Backend"
 
 [project]
 name = "simtrace2-pysniff"
-version = "1.16.1"
+version = "1.17.0"
 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"}