Full T-echo card support + Compact UI (#11342)

* T-echo card

* Update NRF52I2SOutput.cpp

* Update NRF52I2SOutput.h

* cleanup

* Update buzz.cpp

* use consistent runtime compact-panel check instead of mixing with compile-time macro

* Update NodeDB.cpp

* Update ExternalNotificationModule.cpp

* switched to Throttle::isWithinTimespanMs

* Update SharedUIDisplay.h

* trunk fix

* last cleanup

* ClockRenderer.cpp for OLED_COMPACT_UI and setup Unit C6L for new UI.

* Fixed regressions in standard OLED and TFT

---------

Co-authored-by: Jason P <applewiz@mac.com>

src/modules/ExternalNotificationModule.cpp

@@ -40,6 +40,10 @@ bool ascending = true;
 #define PIN_BUZZER false
 #endif
 
+#if defined(HAS_I2S_SPEAKER_NRF52)
+#include "platform/nrf52/NRF52RtttlPlayer.h"
+#endif
+
 /*
     Documentation:
         https://meshtastic.org/docs/configuration/module/external-notification
@@ -77,6 +81,9 @@ int32_t ExternalNotificationModule::runOnce()
 #ifdef HAS_I2S
         // audioThread->isPlaying() also handles actually playing the RTTTL, needs to be called in loop
         isRtttlPlaying = isRtttlPlaying || audioThread->isPlaying();
+#endif
+#if defined(HAS_I2S_SPEAKER_NRF52)
+        isRtttlPlaying = isRtttlPlaying || nrf52RtttlPlayer.isPlaying();
 #endif
         if ((nagCycleCutoff < millis()) && !isRtttlPlaying) {
             // Turn off external notification immediately when timeout is reached, regardless of song state
@@ -145,6 +152,17 @@ int32_t ExternalNotificationModule::runOnce()
             // we need fast updates to play the RTTTL
             delay = EXT_NOTIFICATION_FAST_THREAD_MS;
         }
+#endif
+#if defined(HAS_I2S_SPEAKER_NRF52)
+        // Play RTTTL over the I2S speaker (no piezo on this board).
+        if (canBuzz() && buzzerShouldAlert) {
+            if (nrf52RtttlPlayer.isPlaying()) {
+                nrf52RtttlPlayer.play();
+            } else if (isNagging && (nagCycleCutoff >= millis())) {
+                nrf52RtttlPlayer.begin(rtttlConfig.ringtone);
+            }
+            delay = EXT_NOTIFICATION_FAST_THREAD_MS;
+        }
 #endif
         // now let the PWM buzzer play
         if (moduleConfig.external_notification.use_pwm && config.device.buzzer_gpio && canBuzz() && buzzerShouldAlert) {
@@ -264,6 +282,9 @@ void ExternalNotificationModule::stopNow()
 #ifdef HAS_I2S
     LOG_INFO("Stop audioThread playback");
     audioThread->stop();
+#endif
+#if defined(HAS_I2S_SPEAKER_NRF52)
+    nrf52RtttlPlayer.stop();
 #endif
     // Turn off all outputs
     LOG_INFO("Turning off setExternalStates");