refactor: shared text-entry popup (ui-lvgl) and chat bubble row (ui-new); GPS search clock keeps a found fix

- ui-lvgl: navTextEntry()/TextEntry replace eight copies of popup + field +
  keyboard wiring; one byte-capped insert callback instead of two.
- ui-new: drawHeadedBubble()/BubbleMark replace the duplicated DM and channel
  bubble drawing in MessagesScreen.
- GpsSky::halt(): stopping the receiver ends an unfinished search but keeps
  the first-fix time; keyboard cursor blink restarts after a key.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VeBrxKyHHxWsmttVkUdBrj

examples/companion_radio/ui-lvgl/Keyboard.h

@@ -155,6 +155,7 @@ static const char* s_var_map[13];
 // on another object) can take that state away: put it back after a pick.
 static void keepCursor(lv_obj_t* ta) {
   lv_obj_add_state(ta, LV_STATE_FOCUSED);
+  lv_textarea_set_cursor_pos(ta, lv_textarea_get_cursor_pos(ta));   // restarts the blink (see fieldFocus)
   lv_obj_invalidate(ta);
 }