feat(l2): Arduino 3.x as the published env, limits sized for the PSRAM, stage 7 findings

- Wio_Tracker_L2_companion_solo_lvgl now builds on Arduino-ESP32 3.3.12
  (pioarduino); the 2.0.17 build stays as _solo_lvgl_arduino2 (not published)
- Per-board limits (defaults unchanged, L1 byte-for-byte the same):
  TRAIL_CAPACITY, WAYPOINT_CAPACITY, HIST_CH_MAX / HIST_DM_MAX, NEARBY_MAX;
  the L2 sets 4096 / 64 / 256 / 128 / 64 (in PSRAM with UiCore; internal
  heap 154 KB free after). ui-lvgl: 32 trail segments, contact list 256,
  rooms 32, 50 bubbles per conversation, pickers 128, WiFi scan 20
- Map trail drawing drops points under 2 px apart
- "Nearby" is "Nodes"; advert options "Zero hop" / "Flood"
- Roadmap stage 7: LVGL on other displays -- e-ink stays ui-new, an OLED
  spike after this roadmap, Cardputer as a colour candidate

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

variants/sim/build_wasm.sh

@@ -182,7 +182,9 @@ if [ "$SIM_UI" = "lvgl" ]; then
   for d in "${DEFINES[@]}"; do
     case "$d" in -DDISPLAY_CLASS=*|-DMAX_GROUP_CHANNELS=*) ;; *) kept+=("$d") ;; esac
   done
-  DEFINES=("${kept[@]}" -DDISPLAY_CLASS=SimLcdDisplay -DMAX_GROUP_CHANNELS=40 -DUI_ZOOM=1 -DLV_CONF_INCLUDE_SIMPLE)
+  # The L2's PSRAM-sized limits (solo/wio-tracker-l2/platformio.ini).
+  DEFINES=("${kept[@]}" -DDISPLAY_CLASS=SimLcdDisplay -DMAX_GROUP_CHANNELS=40 -DUI_ZOOM=1 -DLV_CONF_INCLUDE_SIMPLE
+           -DTRAIL_CAPACITY=4096 -DWAYPOINT_CAPACITY=64 -DHIST_CH_MAX=256 -DHIST_DM_MAX=128 -DNEARBY_MAX=64)
   INCLUDES+=("-I$LVGL_DIR")
   LINK_EXTRA=(-sFETCH=1)   # map downloads (LvglPort.h) go through emscripten_fetch
 fi