fix(ui,window): manage unread indicators and paging state accurately

Add logic to track unread message indicators and the paged state in the UI window component, ensuring correct clearing and display of unread markers while navigating.

Files: src/ui/window.c, src/ui/titlebar.c, src/ui/win_types.h

src/ui/titlebar.c

@@ -268,7 +268,11 @@ _show_scrolled(ProfWin* current)
         wattroff(win, bracket_attrs);
 
         wattron(win, scrolled_attrs);
-        wprintw(win, "SCROLLED");
+        if (current->layout->unread_msg == 0) {
+            wprintw(win, "SCROLLED");
+        } else {
+            wprintw(win, "SCROLLED, NEW MESSAGES");
+        }
         wattroff(win, scrolled_attrs);
 
         wattron(win, bracket_attrs);