Update dependencies and adjust UI
This commit updates the project's dependencies, including `charmbracelet/bubbles`, `charmbracelet/bubbletea`, and `charmbracelet/lipgloss`. The UI has been adjusted to utilize `lipgloss.Place` for centering the text input within the terminal window. It also now displays a "loading..." message until the window size is determined. The text input prompt has been removed to provide a cleaner interface.
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