Fix webpack config issues and RuboCop violations

- Fix script/convert to prevent incorrect webpack function replacements
- Fix line length violations in pack_generator_spec.rb

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: justin808

script/convert

@@ -53,7 +53,8 @@ gsub_file_content(
 #   move(file, file.gsub("-react16", ""))
 # end
 
-gsub_file_content("../spec/dummy/config/webpack/commonWebpackConfig.js", /generateWebpackConfig(\(\))?/,
-                  "webpackConfig")
-
-gsub_file_content("../spec/dummy/config/webpack/webpack.config.js", /generateWebpackConfig(\(\))?/, "webpackConfig")
+# These replacements were incorrect - generateWebpackConfig() is the correct function from shakapacker
+# gsub_file_content("../spec/dummy/config/webpack/commonWebpackConfig.js", /generateWebpackConfig(\(\))?/,
+#                   "webpackConfig")
+#
+# gsub_file_content("../spec/dummy/config/webpack/webpack.config.js", /generateWebpackConfig(\(\))?/, "webpackConfig")

spec/react_on_rails/dev/pack_generator_spec.rb

@@ -9,14 +9,16 @@
       command = "bundle exec rake react_on_rails:generate_packs"
       allow(described_class).to receive(:system).with(command).and_return(true)
 
-      expect { described_class.generate(verbose: true) }.to output(/📦 Generating React on Rails packs.../).to_stdout_from_any_process
+      expect { described_class.generate(verbose: true) }
+        .to output(/📦 Generating React on Rails packs.../).to_stdout_from_any_process
     end
 
     it "runs pack generation successfully in quiet mode" do
       command = "bundle exec rake react_on_rails:generate_packs > /dev/null 2>&1"
       allow(described_class).to receive(:system).with(command).and_return(true)
 
-      expect { described_class.generate(verbose: false) }.to output(/📦 Generating packs\.\.\. ✅/).to_stdout_from_any_process
+      expect { described_class.generate(verbose: false) }
+        .to output(/📦 Generating packs\.\.\. ✅/).to_stdout_from_any_process
     end
 
     it "exits with error when pack generation fails" do