Fix useCanCan refresh after sign in

[kaspernj]

Summary

• reload abilities on Devise sign-in/sign-out in useCanCan
• use useEffect for side effects with dependency list
• add system spec for ability refresh after sign-in

Testing

• yarn --cwd /home/dev/Development/api_maker/npm-api-maker eslint src/use-can-can.js
• bundle exec rubocop spec/system/can_can/loader_spec.rb
• xvfb-run bundle exec rspec spec/system/can_can/loader_spec.rb (fails: missing /packs/js assets in dummy app)

[chatgpt-codex-connector]

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