fix: add missing direct devDeps (eslint, prettier, typescript)

Adds eslint@^8.57.1, prettier@^3.0.0, typescript@^5.6.2 as direct
devDependencies so pnpm --frozen-lockfile exposes their binaries
in node_modules/.bin for CI lint/type-check/format-check steps.

Fixes PRI-564.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

package.json

@@ -29,10 +29,13 @@
     "@testing-library/jest-dom": "^6.4.8",
     "@testing-library/react": "^16.0.0",
     "@testing-library/user-event": "^14.5.2",
+    "eslint": "^8.57.1",
     "jsdom": "^24.0.0",
+    "prettier": "^3.0.0",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
     "react-router-dom": "^5.3.0",
+    "typescript": "^5.6.2",
     "vitest": "^3.0.5"
   }
 }