feat(ui): message-wake toggle + all home pages visible by default

Two independent changes, requested together:

1. Settings > Sound > "Msg wake" (NodePrefs::msg_wake_screen_off,
   0xC0DE002A) lets a user disable UITask::newMsg()'s existing behaviour
   of turning the display on for an incoming message when it was off and
   no companion app is connected. Stored inverted so both a fresh device
   and an existing saved-prefs file default to "on" (today's behaviour).
   New sim_test_set_msg_wake_disabled() hook verifies it without scripting
   Settings navigation -- confirmed end to end via a real A<->R<->B mesh
   in Playwright: message delivered while B's screen is off either wakes
   it (enabled) or doesn't (disabled), checked via real canvas pixels.

2. A brand-new or factory-reset device now shows ALL home pages by
   default instead of a curated 5-page carousel (MyMesh.cpp used to seed
   home_pages_mask = HP_DEFAULT; now seeds 0, which every other read site
   already treated as "all visible" -- HP_DEFAULT is now unused, removed).
   Existing users' saved masks are untouched. New sim_test_get_home_pages_mask()
   getter confirms a fresh instance reads back 0.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

examples/companion_radio/main.cpp

@@ -446,14 +446,12 @@ extern "C" EMSCRIPTEN_KEEPALIVE void sim_radio_get_params(float* out_freq, float
   *out_cr   = p ? p->cr   : 0;
 }
 
-// Real hardware ships with NodePrefs::HP_DEFAULT -- a curated 5-page Home
-// carousel (Clock/Tools/Shutdown/Favourites/Map) -- so a first-time user
-// isn't handed 13 pages to joystick through; the rest (Recent/Radio/
-// Bluetooth/Advert/GPS/Sensors) are opt-in via Settings > Home Pages. The
-// demo site exists specifically to show off the whole feature set, so it
-// calls this once right after boot to opt every instance into all of them
-// instead -- 0 means "all visible" (see the home_pages_mask comment in
-// NodePrefs.h), same as an as-yet-unset field on a factory-fresh device.
+// A brand-new device's home_pages_mask defaults to 0 = all pages visible
+// (see NodePrefs.h and MyMesh.cpp) -- this is now a no-op on a freshly
+// booted sim instance, but is kept for a saved-prefs instance whose mask
+// was narrowed by an actual Settings > Home Pages visit (an upgrader whose
+// IDBFS identity predates this default, or a visitor who toggled some
+// pages off before this hook runs on a later boot).
 extern "C" EMSCRIPTEN_KEEPALIVE int sim_test_show_all_home_pages() {
   if (!g_sim_ready) return 0;
   NodePrefs* prefs = the_mesh.getNodePrefs();
@@ -498,6 +496,30 @@ extern "C" EMSCRIPTEN_KEEPALIVE int sim_test_disable_screen_timeout() {
   return 1;
 }
 
+// Sets NodePrefs::msg_wake_screen_off directly (the same field Settings >
+// Sound > "Msg wake" toggles -- SettingsScreen.h's MSG_WAKE item), so a test
+// harness can verify UITask::newMsg()'s wake-gating without scripting the
+// on-device Settings accordion navigation key-by-key.
+extern "C" EMSCRIPTEN_KEEPALIVE int sim_test_set_msg_wake_disabled(int disabled) {
+  if (!g_sim_ready) return 0;
+  NodePrefs* prefs = the_mesh.getNodePrefs();
+  if (!prefs) return 0;
+  prefs->msg_wake_screen_off = disabled ? 1 : 0;
+  return 1;
+}
+
+// Raw home_pages_mask readback -- verifies a fresh instance really does
+// default to 0 (= all pages visible, MyMesh.cpp) without having to count
+// carousel frames on-canvas (unreliable: several home pages, e.g. Clock,
+// redraw with live-changing content every tick, so a page revisited later
+// in the cycle rarely hashes identically to its first visit).
+extern "C" EMSCRIPTEN_KEEPALIVE int sim_test_get_home_pages_mask() {
+  if (!g_sim_ready) return -1;
+  NodePrefs* prefs = the_mesh.getNodePrefs();
+  if (!prefs) return -1;
+  return (int)prefs->home_pages_mask;
+}
+
 // Re-anchors this instance's RTC to the host's real wall clock. SimRTCClock
 // (variants/sim/SimRTCClock.h) already starts out reading time(NULL), so a
 // freshly booted instance needs no help -- but the clock is a shared, live