lint(eslint): surface no-explicit-any as warn to constrain future code (P1-6)

eslint.config.mjs

@@ -59,7 +59,7 @@ export default tseslint.config(
           caughtErrorsIgnorePattern: "^_",
         },
       ],
-      "@typescript-eslint/no-explicit-any": "off",
+      "@typescript-eslint/no-explicit-any": "warn",
       "react-hooks/exhaustive-deps": "warn",
       "react-hooks/incompatible-library": "off",
       "react-hooks/set-state-in-effect": "off",