feat(reticulum): complete messaging, calls, and P4 support

Add official Sideband/LXST messaging and telephony flows, realtime resource ownership, call and ping UI, durable unread state, and bounded Nomad/Micron browsing.

Integrate ESP32-P4/C6 gateway transport, TinyUSB CDC, ES8311 audio, shared Codec2 call media, Reticulum defaults, compatibility settings, and conformance coverage.

platform/linux/common/src/platform/ui/screen_runtime.cpp

@@ -126,6 +126,11 @@ void enter_from_saver()
     wake_saver();
 }
 
+void wake_for_modal()
+{
+    wake_saver();
+}
+
 void update_user_activity()
 {
     wake_saver();