Merge branch 'feat-additional-compensation' of https://github.com/jpirnay/crosspoint-reader into mybuild

# Conflicts:
#	lib/hal/HalClock.cpp
#	src/CrossPointSettings.h
#	src/activities/reader/KOReaderSyncActivity.cpp
#	src/activities/settings/SettingsActivity.cpp
#	src/activities/settings/SettingsActivity.h

lib/hal/HalClock.cpp

@@ -206,7 +206,12 @@ static double computeCorrectedElapsedSec(uint64_t lpNow, float tempNow) {
   // faster/slower than nominal, so the true elapsed wall-clock time
   // differs from the raw LP-derived time by that factor.
   float avgTemp = (rtcTemperatureC + tempNow) * 0.5f;
-  float tempDelta = avgTemp - rtcTemperatureC;  // = (tempNow - rtcTemperatureC) / 2
+  // Positive when COOLED DOWN relative to capture temperature.
+  // ESP32 RC oscillator has a positive temperature coefficient: it runs faster
+  // when hotter, causing the LP timer to over-count. To recover true elapsed
+  // time we must REDUCE the raw LP-derived seconds when the device is warmer
+  // than at capture (and INCREASE them when cooler). Hence the sign inversion.
+  float tempDelta = rtcTemperatureC - avgTemp;  // = (rtcTemperatureC - tempNow) / 2
   float tempFactor = 1.0f + tempDelta * CLOCK_TEMP_DRIFT_SECONDS_PER_SECOND_PER_DEG * rtcDriftScale;
   if (tempFactor < 0.5f) {
     tempFactor = 0.5f;
@@ -281,8 +286,8 @@ bool syncNtp() {
   if (prevSyncTime > 0 && preSyncTime > 0 && rtcEpoch > prevSyncTime) {
     float interval = (float)(rtcEpoch - prevSyncTime);
     // error = how far the local clock was off before NTP corrected it.
-    // Positive means local clock was behind (NTP jumped us forward).
-    // Negative means local clock was ahead (NTP pulled us back).
+    // Negative means local clock was behind (NTP jumped us forward).
+    // Positive means local clock was ahead (NTP pulled us back).
     float error = (float)(preSyncTime - rtcEpoch);
     if (interval >= 60.0f) {
       // Convert to seconds-of-drift per day.