Move SWC test to proper location: client/__tests__/

Moved test from client/app/bundles/ to client/__tests__/ which is the
Jest convention for project-level tests that aren't component-specific.

- Created client/__tests__/ directory (Jest standard)
- Updated testRegex to include __tests__ directory
- This is a better location for configuration/build tests vs bundles/
  which should only contain application code

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

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

Author: justin808

client/app/bundles/swc-config.spec.js renamed to client/__tests__/swc-config.spec.js

@@ -154,7 +154,7 @@
     "setupFiles": [
       "./client/app/libs/testHelper.js"
     ],
-    "testRegex": "./client/app/.*.spec\\.jsx?$",
+    "testRegex": "./client/(app|__tests__)/.*.spec\\.jsx?$",
     "transform": {
       "^.+\\.jsx?$": "babel-jest"
     }