5-state display mode: auto day/night, nightrider, screen off

New ScreenDisplayMode param (fixes ScreenDisaplayMode typo):
  0=auto-normal, 1=auto-nightrider, 2=normal, 3=screen-off, 4=nightrider

Nightrider mode: black background (no camera feed), path/lane lines
drawn as 2px outlines only. Auto mode uses NOAA solar position calc
in gpsd to switch between day/night based on GPS lat/lon and UTC time.
First calc on GPS fix, then every 30 seconds.

Button cycle onroad: 0→4, 1→2, 2→3, 3→4, 4→2 (never back to auto).
Offroad: any→3, 3→0. bench_cmd debugbutton simulates the button press.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

common/params.cc

@@ -252,7 +252,8 @@ std::unordered_map<std::string, uint32_t> keys = {
     // {"SpeedLimitVTSC", PERSISTENT},
 
     {"CPTLkasButtonAction", PERSISTENT},
-    {"ScreenDisaplayMode", PERSISTENT},
+    {"IsDaylight", CLEAR_ON_MANAGER_START},
+    {"ScreenDisplayMode", CLEAR_ON_MANAGER_START},
     
     {"RadarDist", PERSISTENT},
     {"ModelDist", PERSISTENT},