Bring over the TUI to interactive installer (#845)

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

internal/agent/TUIinstallOptionsPage.go

@@ -0,0 +1,78 @@
+package agent
+
+import (
+	"fmt"
+
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/charmbracelet/lipgloss"
+)
+
+// Install Options Page
+type installOptionsPage struct {
+	cursor  int
+	options []string
+}
+
+func newInstallOptionsPage() *installOptionsPage {
+	return &installOptionsPage{
+		options: []string{
+			"Start Install",
+			"Customize Further (User, SSH Keys, etc.)",
+		},
+		cursor: 0,
+	}
+}
+
+func (p *installOptionsPage) Init() tea.Cmd {
+	return nil
+}
+
+func (p *installOptionsPage) Update(msg tea.Msg) (Page, tea.Cmd) {
+	switch msg := msg.(type) {
+	case tea.KeyMsg:
+		switch msg.String() {
+		case "up", "k":
+			if p.cursor > 0 {
+				p.cursor--
+			}
+		case "down", "j":
+			if p.cursor < len(p.options)-1 {
+				p.cursor++
+			}
+		case "enter":
+			if p.cursor == 0 {
+				// Start Install - go to install process
+				return p, func() tea.Msg { return GoToPageMsg{PageID: "summary"} }
+			} else {
+				// Customize Further - go to customization page
+				return p, func() tea.Msg { return GoToPageMsg{PageID: "customization"} }
+			}
+		}
+	}
+	return p, nil
+}
+
+func (p *installOptionsPage) View() string {
+	s := "Installation Options\n\n"
+	s += "Choose how to proceed:\n\n"
+
+	for i, option := range p.options {
+		cursor := " "
+		if p.cursor == i {
+			cursor = lipgloss.NewStyle().Foreground(kairosAccent).Render(">")
+		}
+		s += fmt.Sprintf("%s %s\n", cursor, option)
+	}
+
+	return s
+}
+
+func (p *installOptionsPage) Title() string {
+	return "Install Options"
+}
+
+func (p *installOptionsPage) Help() string {
+	return genericNavigationHelp
+}
+
+func (p *installOptionsPage) ID() string { return "install_options" }