ui: Push commands sub-pills — one form at a time (v3.5.0)

The Push commands pill now switches between four sub-pills - Trigger (Push
SMS), Store (SD admin params), BIP / CAT_TP trigger, TCP trigger - and shows
only the selected form:

- Trigger/Store share one GP administration form (fields unchanged); the mode
  only changes the payload wrapping and the form heading, which now carries
  the HTTP OTA prefix: "HTTP OTA Administrative session trigger (Push SMS)"
  / "HTTP OTA Administrative session store data (SD admin params)".
- BIP/CAT_TP and TCP keep their own headings ("... (TS 102 226 §9)") and
  their "not the administration session" note.
- hotaSetForm() owns the pill styling and form visibility and delegates to
  hotaSetMode() (Trigger/Store) or pushUpdate() (SS9 forms); the view always
  opens on Trigger, nothing is persisted.
sw cache -> simple-v247; help 2.7 EN/RU, READMEs and AGENTS updated.

frontend/sw.js

@@ -1,4 +1,4 @@
-const CACHE = 'simple-v246';
+const CACHE = 'simple-v247';
 const URLS = [
   'index.html',
   'help.html',