fix(toolchain): pin eslint ^9 + typescript ^6 to unbreak dependabot-bumped stack

dependabot's eslint@^10 bump broke eslint-plugin-react 7.37.5 (peer range caps at
^9.7; eslint 10 dropped context.getFilename) -> react/display-name crash.
TS 7 in typescript-eslint peer range breaks @typescript-eslint/parser load.
Pin eslint@^9.39.5 + typescript@^6.0.3; tsparticles pinned ^3 (registry target API).
lint/typecheck/test/build/format all green.

eslint.config.mjs

@@ -34,4 +34,4 @@ const eslintConfig = defineConfig([
   },
 ]);
 
-export default eslintConfig;
+export default eslintConfig;