fix: remove unused ts-jest dependency causing npm install failure

ts-jest peer-conflicts with typescript@7 and jest already uses @swc/jest as its transform, making ts-jest dead weight.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

package.json

@@ -55,7 +55,6 @@
     "jest": "^30.4.2",
     "jest-environment-node": "^30.4.1",
     "tailwindcss": "^4.3.3",
-    "ts-jest": "^29.4.12",
     "ts-node": "^10.9.2",
     "tsconfig-paths": "^4.2.0",
     "typescript": "^7.0.2"