feat(ui-lvgl): title bar with the clock, tidier controls, contextual nav bar

Density from less chrome instead of smaller rows (ROW_H stays 44):
- titled screens drop the status bar; the title bar (APPBAR_H) holds back,
  the title, the screen's actions and the time/battery on a pill; the status
  bar returns for Home, the map, typing, the quick panel and the lock
- one radius (RADIUS) for everything tapped: buttons, tabs, choices, chips
- tabs are all segmented at TAB_H in the body (GPS, Clock converted)
- Nodes: chips row + sort + status line become one toolbar row with
  Show / Order choices; Messages' All/Favourites is the same choice
- nav map: the target bar only while there is a target; the pin opens one
  "Places" popup; back from a map options page restores the map and Map
  tools as left, without a jump
- node detail actions at the top of the scroll; Home tiles fill the page
- rowsFit() leaves growing labels to the flex (a screen title cut to one
  letter after Messages' filter changed)

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

examples/companion_radio/ui-lvgl/RouteScreen.h

@@ -53,7 +53,7 @@ static lv_obj_t* routeSquare(lv_obj_t* row, const char* sym, int code) {
   lv_obj_t* b = lv_button_create(row);
   lv_obj_set_size(b, 30, 26);
   lv_obj_set_style_pad_all(b, 0, 0);
-  lv_obj_set_style_radius(b, theme::RADIUS_SM, 0);
+  lv_obj_set_style_radius(b, theme::RADIUS, 0);
   lv_obj_set_style_shadow_width(b, 0, 0);
   lv_obj_set_style_bg_color(b, lv_color_hex(theme::SURFACE_2), 0);
   lv_obj_add_event_cb(b, onRouteOp, LV_EVENT_CLICKED, (void*)(uintptr_t)code);
@@ -70,7 +70,7 @@ static lv_obj_t* routeRow(lv_obj_t* list, int h, const char* num, const char* na
   styleSurface(r, theme::SURFACE);
   lv_obj_remove_flag(r, LV_OBJ_FLAG_SCROLLABLE);
   lv_obj_set_size(r, LV_PCT(100), h);
-  lv_obj_set_style_radius(r, theme::RADIUS_SM, 0);
+  lv_obj_set_style_radius(r, theme::RADIUS, 0);
   lv_obj_set_style_pad_hor(r, 8, 0);
   lv_obj_set_style_pad_ver(r, 0, 0);
   lv_obj_set_flex_flow(r, LV_FLEX_FLOW_ROW);