rm-hull / git-commit-summary / 18959541683

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test: Add unit tests & introduce dependency injection (#4)

* refactor(app): Introduce dependency injection

Refactor the core application logic to utilize interfaces for
Git and UI operations, allowing dependencies to be injected.

This enables comprehensive unit testing of the application flow
and state transitions, addressing the lack of existing tests.

*   Introduces `app.Git` and `app.UI` interfaces.
*   Adds `github.com/stretchr/testify` for assertion helpers.
*   Includes unit tests for `app`, `config`, and `llm_provider`.

* refactor: Move spinner logic to UI interface

The spinner implementation is now abstracted behind the `UIClient`
interface, decoupling the core application logic from the underlying
library (`github.com/briandowns/spinner`).

This improves separation of concerns and testability.

*   Introduced `StartSpinner`, `UpdateSpinner`, and `StopSpinner`
    methods on `UIClient`.
*   Implemented spinner management in `internal/ui/client.go`.

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