chore(deps): jest 29 -> 30.5.2 test toolchain

- jest ^30.5.2, @types/jest ^30.0.0; ts-jest refreshed in-range to 29.4.15
  (ts-jest peers support jest ^30, typescript <7)
- existing jest.config.mjs (ts-jest ESM preset) validates under jest 30
- note: typescript stays 5.9.3 — ts-jest peer caps typescript <7 and
  @typescript-eslint 8.x caps <6.1.0 (typescript 7 blocked; see follow-up
  commit for typescript 6)

Gate: lint clean, tsc clean, jest 2/2 green under jest 30

package.json

@@ -55,12 +55,12 @@
 		"@graphql-codegen/typescript": "^4.1.6",
 		"@graphql-codegen/typescript-graphql-request": "^6.3.0",
 		"@graphql-codegen/typescript-operations": "^4.6.1",
-		"@types/jest": "^29.5.0",
+		"@types/jest": "^30.0.0",
 		"@types/node": "^24.0.1",
 		"@typescript-eslint/eslint-plugin": "^8.0.0",
 		"@typescript-eslint/parser": "^8.0.0",
 		"eslint": "^8.57.0",
-		"jest": "^29.5.0",
+		"jest": "^30.5.2",
 		"ts-jest": "^29.1.0",
 		"typescript": "^5.8.3"
 	}