Add tip_line() to Ui.hpp and improve registry publish feedback in PublishCommand

Author: GaspardKirira

include/vix/cli/util/Ui.hpp

@@ -59,6 +59,14 @@ namespace vix::cli::util
     os << "  " << YELLOW << "!" << RESET << " " << msg << "\n";
   }
 
+  inline void tip_line(std::ostream &os, std::string_view msg)
+  {
+    os << "  "
+       << CYAN << "tip:" << RESET
+       << " "
+       << BOLD << msg << RESET
+       << "\n";
+  }
   inline void err_line(std::ostream &os, std::string_view msg)
   {
     os << "  " << RED << "✖" << RESET << " " << msg << "\n";

src/commands/PublishCommand.cpp

@@ -1183,8 +1183,12 @@ namespace vix::commands
         if (r.exitCode != 0)
         {
           vix::cli::util::err_line(std::cerr, "failed to update local registry repo (pull --ff-only)");
+
           if (!r.err.empty())
             vix::cli::util::warn_line(std::cerr, r.err);
+
+          vix::cli::util::tip_line(std::cerr, "Run 'vix registry sync' to reset the local registry.");
+
           return r.exitCode;
         }
       }