Updates: a newer release installs by itself, after a question

With Settings > System > Install updates on By itself (issue #52), a
release found by the daily check is offered once no key was pressed for
2 minutes and nothing would be cut by a restart. The question goes over
whatever App is open, with Cancel and Accept, and installs after 30 s
without an answer. Each update that held, and each one undone, is a
dated line in /system/updates.log on the card.

Tried on the device: the question, Cancel, and an install of v0.23.0
left unanswered.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0162FokPdvY2KsS4NBfwyWPk

src/ui/screen.cpp

@@ -12,12 +12,12 @@ bool Screen::begin() {
     return canvas_.createSprite(theme::kWidth, theme::kHeight) != nullptr;
 }
 
-void Screen::render(AppManager& apps, const StatusInfo& status, const Toast* toast) {
+void Screen::render(AppManager& apps, const StatusInfo& status, const Toast* toast, const Question* question) {
     const auto& area = theme::kContent;
     App& app = apps.foreground();
     // An App that keeps what it drew: only the Status Bar is cleared, unless the App has changed
     // or a Toast or the help panel, drawn over it, has just gone.
-    bool overlay = apps.help().isOpen() || toast, retains = app.retainsContent();
+    bool overlay = apps.help().isOpen() || toast || question, retains = app.retainsContent();
     if (overlayWas_ && !overlay) lost_ = true;
     if (retains && &app == lastApp_ && !lost_) {
         canvas_.fillRect(0, 0, theme::kWidth, area.y, theme::kBackground);
@@ -31,6 +31,7 @@ void Screen::render(AppManager& apps, const StatusInfo& status, const Toast* toa
     canvas_.setClipRect(area.x, area.y, area.w, area.h);
     app.draw(canvas_);
     if (apps.help().isOpen()) widgets::help(canvas_, apps.help());  // over the App, under the Status Bar
+    if (question) widgets::dialog(canvas_, question->title, question->message, *question->dialog);
     canvas_.clearClipRect();
     widgets::statusBar(canvas_, status);
     if (toast) widgets::toast(canvas_, *toast);

src/ui/screen.h

@@ -10,7 +10,12 @@ namespace roro {
 class Screen {
    public:
     bool begin();  // allocates the frame buffer (~32 KB at 8-bit colour)
-    void render(AppManager& apps, const StatusInfo& status, const Toast* toast);
+    // A question the device itself asks, over whatever App is open (issue #52).
+    struct Question {
+        std::string title, message;
+        const DialogModel* dialog;
+    };
+    void render(AppManager& apps, const StatusInfo& status, const Toast* toast, const Question* question = nullptr);
     // Takes over the screen while a Firmware Update is received or about to restart.
     void renderUpdate(const std::string& title, const std::string& detail, int percent);
     Canvas& canvas() { return canvas_; }