4a353720d0
Review of 7250dbd:
- the step editor's menu-select form gains a Match case select
(Case-insensitive (default) / Case-sensitive); the step summary flags a
case-sensitive step with (case), the saved params carry
case_sensitive: true only when chosen, and the docs say the editor
authors the flag.
- docs/api.md: fix the 'with an optionally' grammar.
- the Variant-2 menu test's comment claimed a contains match while it is an
exact one; a real contains leg is added ('ыбор' -> item 128).
- timeless rationale for the case-insensitive default; the format note now
dates the change.
sw cache simple-v389 (index.html/help changed).
Tests: 821 frontend + 726 Python.