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/qt/ready.cc

@@ -30,11 +30,12 @@ ReadyWindow::ReadyWindow(QWidget *parent) : QWidget(parent) {
 
     timer = new QTimer(this);
     timer->callOnTimeout(this, &ReadyWindow::refresh);
+    uptime.start();
 }
 
 void ReadyWindow::showEvent(QShowEvent *event) {
   refresh();
-  timer->start(5 * 1000);
+  timer->start(2 * 1000);
 }
 
 void ReadyWindow::hideEvent(QHideEvent *event) {
@@ -43,34 +44,94 @@ void ReadyWindow::hideEvent(QHideEvent *event) {
 
 void ReadyWindow::paintEvent(QPaintEvent *event) {
     QPainter painter(this);
-    QPixmap *img_shown = nullptr;
+    painter.fillRect(rect(), Qt::black);
 
     if (is_hot) {
         if (img_hot.isNull()) {
             img_hot.load("/data/openpilot/selfdrive/clearpilot/theme/clearpilot/images/hot.png");
         }
-        img_shown = &img_hot;
+        int x = (width() - img_hot.width()) / 2;
+        int y = (height() - img_hot.height()) / 2;
+        painter.drawPixmap(x, y, img_hot);
     } else {
-        if (img_ready.isNull()) {
-            img_ready.load("/data/openpilot/selfdrive/clearpilot/theme/clearpilot/images/ready.png");
+        // Boot logo — same rotation as spinner (bg.jpg is pre-rotated 90° CW for framebuffer)
+        if (img_bg.isNull()) {
+            QPixmap raw("/usr/comma/bg.jpg");
+            if (!raw.isNull()) {
+                QTransform rot;
+                rot.rotate(-90);
+                img_bg = raw.transformed(rot);
+            }
+        }
+        if (!img_bg.isNull()) {
+            QPixmap scaled = img_bg.scaled(size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
+            int x = (width() - scaled.width()) / 2;
+            int y = (height() - scaled.height()) / 2;
+            painter.drawPixmap(x, y, scaled);
         }
-        img_shown = &img_ready;
-    }
 
-    int x = (width() - img_shown->width()) / 2;
-    int y = (height() - img_shown->height()) / 2;
-    painter.drawPixmap(x, y, *img_shown);
+        if (error_msg.isEmpty() && !has_driven) {
+            // "READY!" 8-bit text sprite, 15% below center — only before first drive
+            static QPixmap ready_text("/data/openpilot/selfdrive/clearpilot/theme/clearpilot/images/ready_text.png");
+            if (!ready_text.isNull()) {
+                int tx = (width() - ready_text.width()) / 2;
+                int ty = height() / 2 + height() * 15 / 100;
+                painter.drawPixmap(tx, ty, ready_text);
+            }
+        } else {
+            // Error state: red text at 25% below center
+            QFont font("Inter", 50, QFont::Bold);
+            painter.setFont(font);
+            painter.setPen(QColor(0xFF, 0x44, 0x44));
+            int ty = height() / 2 + height() * 25 / 100;
+            QRect text_rect(0, ty, width(), 100);
+            painter.drawText(text_rect, Qt::AlignHCenter | Qt::AlignTop, error_msg);
+        }
+    }
 }
 
 void ReadyWindow::refresh() {
+    bool changed = false;
+
+    // Temperature check
     std::string bytes = params.get("Offroad_TemperatureTooHigh");
+    bool was_hot = is_hot;
     if (!bytes.empty()) {
         auto doc = QJsonDocument::fromJson(bytes.data());
         is_hot = true;
         cur_temp = doc["extra"].toString();
-        update();
-    } else if (is_hot) {
+    } else {
         is_hot = false;
-        update();
     }
+    if (is_hot != was_hot) changed = true;
+
+    // Error state checks (only when not hot — hot has its own display)
+    if (!is_hot) {
+        QString prev_error = error_msg;
+
+        // Panda check — same logic as sidebar, with 10s grace period on startup
+        if (uptime.elapsed() > 10000 &&
+            uiState()->scene.pandaType == cereal::PandaState::PandaType::UNKNOWN) {
+            error_msg = "PANDA NOT CONNECTED";
+        }
+        // Car unrecognized check
+        else if (!params.get("Offroad_CarUnrecognized").empty()) {
+            error_msg = "CAR NOT RECOGNIZED";
+        }
+        else {
+            error_msg = "";
+        }
+
+        if (error_msg != prev_error) changed = true;
+    }
+
+    // Reset has_driven on ignition off→on (power cycle)
+    bool started = uiState()->scene.started;
+    if (!last_started && started) {
+      has_driven = false;
+      changed = true;
+    }
+    last_started = started;
+
+    if (changed) update();
 }