Fix typo and idiomatic empty check in converter_lib.cpp

[Copilot]

Two independent code quality fixes in converter_lib.cpp.

• Typo fix: Rename filed_id → file_id in GetMainFileName
• Idiomatic check: Replace name.size() == 0 with name.empty()

Original prompt

Please apply the following diffs and create a pull request.
Once the PR is ready, give it a title based on the messages of the fixes being applied.

[{"message":"Corrected spelling of 'filed_id' to 'file_id'.","fixFiles":[{"filePath":"cpp2rust/converter/converter_lib.cpp","diff":"diff --git a/cpp2rust/converter/converter_lib.cpp b/cpp2rust/converter/converter_lib.cpp\n--- a/cpp2rust/converter/converter_lib.cpp\n+++ b/cpp2rust/converter/converter_lib.cpp\n@@ -274,8 +274,8 @@\n \n std::string GetMainFileName(const clang::ASTContext &ctx) {\n   const auto &src_mgr = ctx.getSourceManager();\n-  auto filed_id = src_mgr.getMainFileID();\n-  auto file_entry = src_mgr.getFileEntryRefForID(filed_id);\n+  auto file_id = src_mgr.getMainFileID();\n+  auto file_entry = src_mgr.getFileEntryRefForID(file_id);\n   auto file_path = file_entry->getName();\n   auto file_name = llvm::sys::path::filename(file_path);\n   return llvm::sys::path::stem(file_name).str();\n"}]},{"message":"Use name.empty() instead of name.size() == 0 for checking if a string is empty. This is more idiomatic and clearly expresses intent.","fixFiles":[{"filePath":"cpp2rust/converter/converter_lib.cpp","diff":"diff --git a/cpp2rust/converter/converter_lib.cpp b/cpp2rust/converter/converter_lib.cpp\n--- a/cpp2rust/converter/converter_lib.cpp\n+++ b/cpp2rust/converter/converter_lib.cpp\n@@ -399,7 +399,7 @@\n     }\n   }\n \n-  if (name.size() == 0) {\n+  if (name.empty()) {\n     name = \"self\";\n   }\n \n"}]},{"message":"Recursive call to GetTemplateArgs(clang::QualType) with a single argument, but the function signature requires two parameters (qual_type and expr). This will result in a compilation error or call to a different overload if it exists. Pass nullptr as the second argument to match the function signature.","fixFiles":[{"filePath":"cpp2rust/converter/converter_lib.cpp","diff":"diff --git a/cpp2rust/converter/converter_lib.cpp b/cpp2rust/converter/converter_lib.cpp\n--- a/cpp2rust/converter/converter_lib.cpp\n+++ b/cpp2rust/converter/converter_lib.cpp\n@@ -539,7 +539,7 @@\n   if (auto pt = qual_type->getPointeeType(); !pt.isNull())\n     qual_type = pt;\n \n-  return GetTemplateArgs(qual_type);\n+  return GetTemplateArgs(qual_type, nullptr);\n }\n \n clang::Expr *GetCallObject(clang::CallExpr *expr) {\n"}]}]

[nunoplopes]

@copilot revert this change

[Copilot]

Done — reverted in 7836d00.