Group Flight logbook toggle with other switches, real screen-off on timeout

Moves "Flight logbook ON/OFF" into the group of plain on/off toggles
in the Flight Options menu, right under Proximity LED, alongside the
other LED-driven alerts and the ground-vehicle filter.

The inactivity screen timeout (Menu > System > Timeout) now turns the
backlight fully off (0) instead of just dimming it, for users who want
to keep the flight logbook running without needing the screen. Night
dimming (a separate setting) already covers the "just a bit darker"
case and is unaffected. Tapping the screen still wakes it back up to
the configured normal (or night-dimmed) brightness.

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

src/main.cpp

@@ -52,7 +52,6 @@ bool wasEmergency = false;
 bool bannerBlinkOn = false;
 
 constexpr uint8_t BACKLIGHT_FULL = 255;
-constexpr uint8_t BACKLIGHT_DIMMED = 12;
 constexpr uint8_t BACKLIGHT_PWM_CHANNEL = 0;
 uint32_t lastInteractionMs = 0;
 bool screenDimmed = false;
@@ -605,7 +604,16 @@ void loop() {
     if (!screenDimmed && timeoutMin > 0) {
         uint32_t timeoutMs = (uint32_t)timeoutMin * 60000UL;
         if (nowMs - lastInteractionMs >= timeoutMs) {
-            ledcWrite(BACKLIGHT_PWM_CHANNEL, min(BACKLIGHT_DIMMED, normalBacklightPwm()));
+            // Bewusst ganz aus (0) statt nur gedimmt - fuer den
+            // Bildschirm-Timeout (Menue > System > Timeout). Dimmen
+            // uebernimmt bereits der separate Nachtmodus
+            // (updateNightDimming()); der Inaktivitaets-Timeout soll das
+            // Display wirklich abschalten, z.B. fuer Plane-Spotter, die nur
+            // das Flugbuch mitlaufen lassen wollen, ohne den Screen zu
+            // brauchen. Ein Antippen weckt ihn ueber den screenDimmed-Zweig
+            // oben wieder auf die eingestellte Helligkeit (bzw. Nachtmodus-
+            // Helligkeit, falls gerade Nachtstunden sind).
+            ledcWrite(BACKLIGHT_PWM_CHANNEL, 0);
             screenDimmed = true;
         }
     }