Files view: the jumped-to record stays selected (v2.6.2)

- focusMessage()/scrollToType() highlighted the target and removed the class
  after 1500 ms, so a Files-row (or map/category) jump looked selected for a
  moment and then lost it; on top of that any re-render (the 500 ms live
  poll, a filter/search change) rebuilt the list and dropped the highlight —
  even for a clicked entry
- the selection is now persistent app state (STATE.selectedIdx): the render
  marks the entry (gap rows included), focusMessage records the index before
  rendering, showDetail records it for plain clicks, scrollToType persists it
  too (clearing the previous highlight), and a new session/capture resets it
  so a stale index cannot mark an unrelated APDU
- tests: a stub-driven focusMessage case (state + detail updated, no render
  and no timer), the filter-clearing case, and source pins for
  renderMessages, focusMessage, scrollToType, showDetail, loadSession and
  startCapture; 527 Python + 58 Node tests
- README/README_RUS: the jump leaves the record selected; PWA_VERSION/
  pyproject/version.py 2.6.2, SW cache simtrace-analyser-v76

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.backends._legacy:_Backend"
 
 [project]
 name = "simtrace-analyser"
-version = "2.6.1"
+version = "2.6.2"
 description = "SIMtrace Analyser — APDU trace analyser for GSMTAP/PCAP captures (bundles the simtrace2-pysniff utility)"
 readme = {file = "README.md", content-type = "text/markdown"}
 license = {text = "GPL-2.0-or-later"}