ui: rename the Phone simulator tab to Simulator and the eSIM pill to eSIM LPA (v3.5.12)

- Top-level tab label "Phone simulator" -> "Simulator" (RU "Симулятор");
  the DOM ids stay tab-phone / phone-sub-*.
- The eSIM pill inside the Simulator tab is now "eSIM LPA" (EN/RU),
  matching the section's ES10/LPA scope; the panel id stays phone-sub-esim.
- Documentation updated: help EN/RU (section 8 Simulator, list of the four
  pills including Test script, tab lists and cross-references),
  README/README_RUS (tab lists, Simulator section, eSIM LPA), AGENTS
  repo/root.
- Test titles updated; version 3.5.12; sw cache simple-v265.

579 frontend / 467 Python green.

pysim_simple_server/server.py

@@ -31,7 +31,7 @@ from osmocom.tlv import BER_TLV_IE
 from osmocom.utils import rpad
 
 
-VERSION = '3.5.11'
+VERSION = '3.5.12'
 
 MAX_ENVELOPE_SEGMENTS = 5  # max SMS segments for outgoing C-APDU in ENVELOPE