Topbar: title trim, shorter search, the view selector pinned above the panel (v2.6.3)

- the header title drops its "UICC" prefix — "GSMTAP trace analyser" is enough
- the trace topbar's search input is half its previous width (flex basis
  33.333% -> 16.667%); the session name now ellipsizes instead of wrapping
  the tighter row
- the side-panel view selector moved out of the scrollable side panel into
  the trace topbar: right-aligned over the panel at the panel's width
  (--side-panel-w: 260px, the negative right margin cancelling the topbar's
  16px padding so the edges line up), so it stays visible at all times while
  the panel scrolls
- tests: the topbar/selector position pins (the Files-view wiring test and
  style.test.js), the shared width variable, the halved search basis and the
  title; 527 Python + 61 Node tests
- README/README_RUS: the selector's new place; PWA_VERSION/pyproject/
  version.py 2.6.3, SW cache simtrace-analyser-v77

README.md

@@ -199,8 +199,10 @@ in the stored wire shape and are skipped with a note in the import report.
 
 ### Files view (per-file tracking)
 
-The Trace tab's side panel has a view selector (*Map* / *Stats* / **Files**;
-a drop-down, since three tab captions no longer fit).  The Files view is a
+The Trace tab has a view selector (*Map* / *Stats* / **Files**) in its topbar,
+right-aligned over the side panel with the panel's width, so it stays visible
+while the panel scrolls (a drop-down, since three tab captions no longer
+fit).  The Files view is a
 trace-wide timeline of file operations — every **Read**, **Update** and
 **Changed on card** row shows the same file name as the Map view, and clicking
 a row jumps straight to the APDU in the trace and leaves it highlighted