Move swc-loader and @swc/core to devDependencies in Pro package.json files

These are build-time tools and should be in devDependencies, not dependencies.

Changes:
- react_on_rails_pro/spec/dummy/package.json: Moved @swc/core and swc-loader to devDependencies
- react_on_rails_pro/spec/execjs-compatible-dummy/package.json: Moved @swc/core and swc-loader to devDependencies

Both entries maintain the same version strings (^1.7.0 and ^0.2.6).

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

Co-Authored-By: Claude <noreply@anthropic.com>

Author: justin808

react_on_rails_pro/spec/dummy/package.json

@@ -64,8 +64,6 @@
     "sass-loader": "^12.3.0",
     "sass-resources-loader": "^2.0.0",
     "shakapacker": "9.3.0",
-    "swc-loader": "^0.2.6",
-    "@swc/core": "^1.7.0",
     "style-loader": "^3.3.1",
     "tailwindcss": "^3.2.7",
     "terser-webpack-plugin": "5",
@@ -81,6 +79,7 @@
     "@babel/preset-typescript": "^7.23.2",
     "@playwright/test": "^1.56.1",
     "@pmmmwh/react-refresh-webpack-plugin": "0.5.3",
+    "@swc/core": "^1.7.0",
     "@tailwindcss/aspect-ratio": "^0.4.2",
     "@tailwindcss/forms": "^0.5.3",
     "@tailwindcss/typography": "^0.5.9",
@@ -90,6 +89,7 @@
     "jsdom": "^16.4.0",
     "pino-pretty": "^13.0.0",
     "preload-webpack-plugin": "^3.0.0-alpha.1",
+    "swc-loader": "^0.2.6",
     "typescript": "^5.2.2",
     "webpack-dev-server": "^4.7.3"
   },

react_on_rails_pro/spec/execjs-compatible-dummy/package.json

@@ -31,8 +31,6 @@
     "react-dom": "^18.3.1",
     "react-on-rails": "link:.yalc/react-on-rails",
     "shakapacker": "9.3.0",
-    "swc-loader": "^0.2.6",
-    "@swc/core": "^1.7.0",
     "style-loader": "^4.0.0",
     "terser-webpack-plugin": "5",
     "webpack": "5",
@@ -46,7 +44,9 @@
   },
   "devDependencies": {
     "@pmmmwh/react-refresh-webpack-plugin": "^0.5.15",
+    "@swc/core": "^1.7.0",
     "react-refresh": "^0.14.2",
+    "swc-loader": "^0.2.6",
     "webpack-dev-server": "4"
   }
 }