rm-hull / git-commit-summary / 19185599955

Pull #15

github

refactor: Move app execution into TUI model

The core application runtime logic has been moved entirely into the
Bubble Tea (`github.com/charmbracelet/bubbletea`) UI component model.

This simplifies `app.Run` by delegating the entire workflow (Git
checks, LLM calling, spinner management, and commit message editing)
to the TUI state machine.

Other changes:
*   Replaced deprecated external spinner/color libraries with
    `lipgloss` and `bubbles/spinner`.
*   Introduced `internal/interfaces` for Git interaction definitions.

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