feat(l1): one title bar, page dots, disclosure marks and push buttons

drawScreenHeader replaces drawCenteredHeader on every ui-new screen: the
title in normal case, page dots instead of "TRAIL 1/3", the menu hint, no
icon (the screen was just picked by one). Accordions in Settings and Tools
show a disclosure triangle instead of +/-, Tools sections drop their icons.
Form "[Save]" rows and "+ Send" share drawButton; form fields use valueRow.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

examples/companion_radio/ui-new/AutoAdvertScreen.h

@@ -28,7 +28,7 @@ public:
   int render(DisplayDriver& display) override {
     display.setTextSize(1);
     display.setColor(DisplayDriver::LIGHT);
-    display.drawCenteredHeader("AUTO-ADVERT");
+    drawScreenHeader(display, "Auto-advert");
     int sel = 0, scroll = 0;
     drawList(display, 1, sel, scroll, [&](int, int y, bool is_sel, int reserve) {
       drawRowSelection(display, y, is_sel, reserve);