APDU list + detail: hover and the detail header follow the theme tints

- the detail header used --bg-input in dark mode (plus a light-only #dbeafe
  override), so it only matched the list selection in the light theme; it now
  uses var(--selected-bg) — the same variable as the selected row — so the two
  are in sync in both themes (light unchanged)
- .apdu-entry:hover used --bg-panel (a grey in the same family as the GET
  RESPONSE pair rows); both themes now set --hover-bg — the accent at 16%
  (dark) / 10% (light), a translucent tint that stacks with whatever the row's
  background is — and a single hover rule uses it: hovering tints the row
  blue, lighter than the selection and a different hue from the pair rows.
  The rules stay ordered .apdu-pair → :hover → .selected, so hovering the
  selected row keeps its selection colour
- Node tests pin the hover variable per theme, the hover rule (and that the
  old grey rule is gone) and the detail header's variable; 540 Python +
  80 Node tests
- SW cache simtrace-analyser-v91 (cosmetic, no version bump)

frontend/sw.js

@@ -1,4 +1,4 @@
-const CACHE = 'simtrace-analyser-v90';
+const CACHE = 'simtrace-analyser-v91';
 
 const PRECACHE = [
     'index.html',