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/ThreadView.h

@@ -64,9 +64,10 @@ void UITask::setKeyboardVisible(bool show) {
     fieldFocus(_compose_ta, false);
   }
   if (_header && _body) {
-    int top = theme::STATUS_H + (show ? 0 : lv_obj_get_height(_header));
+    int top = show ? theme::STATUS_H : theme::APPBAR_H;   // typing: the slimmer status bar in its place
     if (show) lv_obj_add_flag(_header, LV_OBJ_FLAG_HIDDEN);
     else      lv_obj_remove_flag(_header, LV_OBJ_FLAG_HIDDEN);
+    statusBarSync();
     lv_obj_set_pos(_body, 0, top);
     lv_obj_set_height(_body, lv_display_get_vertical_resolution(NULL) - top);
   }
@@ -139,7 +140,6 @@ void UITask::buildThread() {
   lv_obj_set_style_pad_all(body, 0, 0);
   lv_obj_set_style_pad_row(body, 0, 0);
   if (_header && (_thread_is_channel || can_send)) {   // channel / conversation options
-    lv_obj_set_width(lv_obj_get_child(_header, 1), 200);   // title, clear of the button
     headerButton(_header, LV_SYMBOL_SETTINGS, _thread_is_channel ? onChanThreadMenu : onConvThreadMenu, 4, NULL);
   }
 
@@ -286,7 +286,7 @@ static void msgLocButton(lv_obj_t* parent, const char* text, bool save, bool acc
   lv_obj_set_size(b, LV_SIZE_CONTENT, 28);
   lv_obj_set_style_pad_hor(b, 10, 0);
   lv_obj_set_style_pad_ver(b, 0, 0);
-  lv_obj_set_style_radius(b, LV_RADIUS_CIRCLE, 0);
+  lv_obj_set_style_radius(b, theme::RADIUS, 0);
   lv_obj_set_style_shadow_width(b, 0, 0);
   // on our own amber bubble the main one goes dark instead
   lv_obj_set_style_bg_color(b, lv_color_hex(accent ? (own ? theme::BG : theme::ACCENT) : theme::SURFACE_2), 0);