fix: fix clap manual output error.

- fix the issue that the executable in clap manual output is full path, not the file name.

src/yycc/carton/clap/manual.cpp

@@ -5,6 +5,7 @@
 #include "../../patch/libcxx/enumerate.hpp"
 #include "../../string/op.hpp"
 #include "../../env.hpp"
+#include <filesystem>
 #include <ranges>
 
 #define CLAP ::yycc::carton::clap
@@ -112,8 +113,9 @@ namespace yycc::carton::clap::manual {
         // only print usage if we can fetch the name of executable
         auto executable = ENV::current_exe();
         if (executable.has_value()) {
+            // Get the filename part and print
             TERMCOLOR::cprintln(trctx.usage_title, TERMCOLOR::Color::Yellow, TERMCOLOR::Color::Default, TERMCOLOR::Attribute::Default, dst);
-            dst << INDENT << FORMAT::format(trctx.usage_body, executable.value().u8string()) << std::endl;
+            dst << INDENT << FORMAT::format(trctx.usage_body, executable.value().filename().u8string()) << std::endl;
         }
 
         const auto &variables = app.get_variables();