v3.13.0: the Simulator's event forms honour the preset's CAT release

The consumption half of the release guard: the event-download forms hide the
parameters introduced after the effective release and say so.

- catEffectiveReleaseInfo(cards, iccid): the equipped card's preset (ICCID
  match, the same rule the SCP80 views use) resolved through presetRelease(),
  else the default Rel-12.
- eventFieldsForRelease(cfg, rel): a field whose introduction release (`rel`)
  is above the effective one is hidden; a field without a known release is
  never hidden.  The EVENT_FORMS annotations verified against the pinned
  specs/histories: the MT call IMS URI (Rel-12, CR 12.4.0 "URI support in MT
  Call event"), the CSG cell selection PLMN ID (Rel-12, 12.1.0), the IMS
  registration IMPU list + status code (Rel-11), the slices S-NSSAI-mapping
  and rejected objects (Rel-18).
- The form notes what was hidden: "hidden parameters: N · introduced after
  Rel-12 · preset: X" (or "default release"), with a tooltip naming the
  source; the send path already skips absent fields, so no builder changes.
- help EN/RU; sw cache simple-v369.

frontend/help.html

@@ -510,7 +510,7 @@
 		<li><strong>Data Connection Status Change</strong> (0x1D) &mdash; status (successful / rejected / dropped-deactivated), connection type (PDP / PDN / PDU), optional (E/5G)SM cause, transaction identifier and location status, plus optional date-time, access technology, APN, PDP/PDN/PDU type and location information (MCC/MNC + LAC + Cell ID) &mdash; TS 131 111 &sect;7.5.25</li>
 		<li><strong>Poll Interval Negotiation</strong> (0x1C) — proposes a poll interval as a Duration (unit + value); after sending, the UICC's answer is shown (accepted / rejected / modified + duration), and a <em>modified</em> duration becomes the background poll interval (TS 102 223 &sect;7.5.22). The form appears when the card subscribed to this event.</li>
 	</ul>
-	<p class="text-sm mb-3">Sending an event uses <code class="font-mono text-sm">ENVELOPE(Event Download)</code> per TS 102 223 / TS 131 111.</p>
+	<p class="text-sm mb-3">Sending an event uses <code class="font-mono text-sm">ENVELOPE(Event Download)</code> per TS 102 223 / TS 131 111. The form hides the parameters introduced after the <strong>effective CAT release</strong> &mdash; the equipped card preset's <code class="font-mono text-sm">CAT release</code> (matched by ICCID), or Rel-12 when unspecified &mdash; and a note under the form names the source and what was hidden (the release is set in the Cards tab).</p>
 
 	<h3 id="proactive-log" class="text-lg font-medium mb-2">8.3 Proactive command log</h3>
 	<p class="text-sm mb-2">Chronological list of fetched proactive commands. Each row shows the elapsed time, type code, name, and a decoded qualifier (for commands that have one). Expanding a row shows the decoded command: DISPLAY TEXT / SELECT ITEM / SET UP MENU text and items, BIP channel parameters, TIMER MANAGEMENT actions, PROVIDE LOCAL INFORMATION qualifier names (all standard qualifiers, including ESN 07, MEID 0B and Supported RATs 1A), and SEND SHORT MESSAGE &mdash; the SMS TPDU is parsed (type, TP-MR, TP-DA, TP-PID, TP-DCS, validity period, TP-UDL) with the user data shown as text for text codings (GSM&nbsp;7-bit, UCS2, 8-bit) or as a secured packet (TS&nbsp;31.115) when TP-PID&nbsp;=&nbsp;<code class="font-mono text-sm">7F</code> (SIM data download); UDH concatenation headers are decoded. Commands with response data show a <code class="font-mono text-sm">Response:</code> line with the TERMINAL RESPONSE bytes (boilerplate TLVs stripped); PROVIDE LOCAL INFORMATION responses are decoded using the PLI data dictionary decoders.</p>