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/UITask.h

@@ -24,6 +24,20 @@ struct UiEvent;
 
 namespace mapview { struct TileArea; }
 
+// A popup that asks for one line of text: the field over the keyboard. `done`
+// gets the keyboard's READY (OK) and CANCEL; the field is _nav_ta, the keyboard
+// _nav_kb, until navClosePopup().
+struct TextEntry {
+  const char* title;
+  lv_event_cb_t done;
+  const char* text = nullptr;       // what the field starts with
+  const char* hint = nullptr;       // placeholder
+  size_t max_bytes = 0;             // UTF-8 bytes the field takes; 0 = no limit
+  bool password = false;
+  const char* accepted = nullptr;   // only these characters (lv_textarea_set_accepted_chars)
+  bool symbols = false;             // open on the digits / symbols page
+};
+
 class UITask : public UITaskBase, public UiCoreHost {
 public:
   UITask(mesh::MainBoard* board, BaseSerialInterface* serial) : UITaskBase(board, serial) {}
@@ -385,6 +399,7 @@ private:
   void navFrameTarget();
   void navSetTarget(uint8_t kind, const uint8_t* key, int32_t lat, int32_t lon, const char* name);
   lv_obj_t* navPopupPanel(const char* title, bool full, bool bottom = false);
+  lv_obj_t* navTextEntry(const TextEntry& t);   // popup + one-line field + keyboard (NavMap.h)
   void navRenamePopup(int idx);
   void navAddWaypoint(int32_t lat, int32_t lon);
   void navDropAt(int x, int y);