port C++ UI from broken: ready/splash, ClearPilot menu, onroad widgets, nightrider

Wholesale port of the 10 UI files (main.cc, ui.{cc,h}, onroad.{cc,h},
home.{cc,h}, window.{cc,h}, ready.{cc,h}, SConscript). sidebar.{cc,h}
unchanged.

Brings in:
- splash/ready screen rendered via Qt directly (replaces stock home)
- ready page shown when started but gear=park
- ClearPilot offroad menu (Home/Dashcam/Debug panels) replacing stock
- onroad UI: speed widget reading ClearpilotSpeedDisplay (gpsLocation
  via speed_logicd), speed-limit widget, cruise-vs-limit warning sign
- nightrider mode: camera suppressed, lane lines/path drawn as 2px
  outlines only (ScreenDisplayMode 1 or 4)
- screen power: ScreenDisplayMode 3 forces setAwake(false)
- ignition off blanks screen immediately (tap still wakes)
- Qt-based RPC widget-tree dump server at ipc:///tmp/clearpilot_ui_rpc
- crash handler in main.cc with stack trace

Deviation from broken (3 sites): no_lat_lane_change is read from
paramsMemory (controlsd writes it there in baseline) instead of broken's
custom cereal field frogpilotCarControl.noLatLaneChange. Keeps the
existing self-driving wiring intact.

SConscript drops screenrecorder.cc from qt_src (broken did the same;
omx_encoder.cc still built for dashcamd's future link).

Build clean. UI hasn't been launched yet — that comes after the
controlsd button-handler commit lands.

Translation .ts files are auto-regenerated by Qt's lupdate; included.

selfdrive/ui/SConscript

@@ -39,7 +39,7 @@ qt_src = ["main.cc", "qt/sidebar.cc", "qt/onroad.cc", "qt/body.cc",
           "qt/window.cc", "qt/home.cc", "qt/offroad/settings.cc",
           "qt/offroad/software_settings.cc", "qt/offroad/onboarding.cc",
           "qt/offroad/driverview.cc", "qt/offroad/experimental_mode.cc",
-          "../frogpilot/screenrecorder/omx_encoder.cc", "../frogpilot/screenrecorder/screenrecorder.cc",
+          "../frogpilot/screenrecorder/omx_encoder.cc",  # kept for dashcamd .o dependency
           "qt/ready.cc"]
 
 # build translation files
@@ -77,8 +77,7 @@ qt_env.Program("_text", ["qt/text.cc"], LIBS=qt_libs)
 qt_env.Program("_spinner", ["qt/spinner.cc"], LIBS=qt_libs)
 
 
-# Clearpilot
-# Create clearpilot tools
+# Clearpilot tools
 qt_env.Program("/data/openpilot/system/clearpilot/tools/qt_shell", ["/data/openpilot/system/clearpilot/tools/qt_shell.cc"], LIBS=qt_libs)
 
 # build main UI