Fix swc.config.js to match project linting standards

Updated config/swc.config.js to follow project's Prettier/ESLint rules:
- Changed double quotes to single quotes (singleQuote: true)
- Added trailing commas to all objects/arrays (trailingComma: all)

The Shakapacker-generated swc.config.js template uses double quotes and
no trailing commas, which violates the project's standard linting rules.

Verified with: yarn prettier config/swc.config.js --check

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

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

Author: justin808

config/swc.config.js

@@ -5,21 +5,21 @@
 module.exports = {
   jsc: {
     parser: {
-      syntax: "ecmascript",
+      syntax: 'ecmascript',
       jsx: true,
       dynamicImport: true,
-      decorators: false
+      decorators: false,
     },
     transform: {
       react: {
-        runtime: "automatic"
+        runtime: 'automatic',
       },
       // Disable optimizer to preserve class structure for Stimulus
       optimizer: {
         globals: {
-          vars: {}
-        }
-      }
+          vars: {},
+        },
+      },
     },
     // Critical for Stimulus: preserve class names and method bindings
     keepClassNames: true,
@@ -28,10 +28,10 @@ module.exports = {
     // Don't use external helpers
     externalHelpers: false,
     // Target ES2022 to avoid transforming class features
-    target: "es2022"
+    target: 'es2022',
   },
   // Preserve ES6 module semantics
   module: {
-    type: "es6"
-  }
+    type: 'es6',
+  },
 };