feat: refactor TUI with read-only info view and optimized layout

- Add new 'i' command for read-only host information display
- Implement info view with option to switch to edit mode (e/Enter)
- Hide User and Port columns to optimize table space usage
- Improve table height calculation for better host visibility
- Add proper message handling for info view navigation
- Interface optimization

internal/ui/info_form.go

@@ -0,0 +1,227 @@
+package ui
+
+import (
+	"fmt"
+	"sshm/internal/config"
+	"strings"
+
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/charmbracelet/lipgloss"
+)
+
+type infoFormModel struct {
+	host       *config.SSHHost
+	styles     Styles
+	width      int
+	height     int
+	configFile string
+	hostName   string
+}
+
+// Messages for communication with parent model
+type infoFormEditMsg struct {
+	hostName string
+}
+
+type infoFormCancelMsg struct{}
+
+// NewInfoForm creates a new info form model for displaying host details in read-only mode
+func NewInfoForm(hostName string, styles Styles, width, height int, configFile string) (*infoFormModel, error) {
+	// Get the existing host configuration
+	var host *config.SSHHost
+	var err error
+
+	if configFile != "" {
+		host, err = config.GetSSHHostFromFile(hostName, configFile)
+	} else {
+		host, err = config.GetSSHHost(hostName)
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	return &infoFormModel{
+		host:       host,
+		hostName:   hostName,
+		configFile: configFile,
+		styles:     styles,
+		width:      width,
+		height:     height,
+	}, nil
+}
+
+func (m *infoFormModel) Init() tea.Cmd {
+	return nil
+}
+
+func (m *infoFormModel) Update(msg tea.Msg) (*infoFormModel, tea.Cmd) {
+	switch msg := msg.(type) {
+	case tea.WindowSizeMsg:
+		m.width = msg.Width
+		m.height = msg.Height
+		m.styles = NewStyles(m.width)
+		return m, nil
+
+	case tea.KeyMsg:
+		switch msg.String() {
+		case "ctrl+c", "esc", "q":
+			return m, func() tea.Msg { return infoFormCancelMsg{} }
+
+		case "e", "enter":
+			// Switch to edit mode
+			return m, func() tea.Msg { return infoFormEditMsg{hostName: m.hostName} }
+		}
+	}
+
+	return m, nil
+}
+
+func (m *infoFormModel) View() string {
+	var b strings.Builder
+
+	// Title
+	title := fmt.Sprintf("SSH Host Information: %s", m.host.Name)
+	b.WriteString(m.styles.FormTitle.Render(title))
+	b.WriteString("\n\n")
+
+	// Create info sections with consistent formatting
+	sections := []struct {
+		label string
+		value string
+	}{
+		{"Host Name", m.host.Name},
+		{"Hostname/IP", m.host.Hostname},
+		{"User", formatOptionalValue(m.host.User)},
+		{"Port", formatOptionalValue(m.host.Port)},
+		{"Identity File", formatOptionalValue(m.host.Identity)},
+		{"ProxyJump", formatOptionalValue(m.host.ProxyJump)},
+		{"SSH Options", formatSSHOptions(m.host.Options)},
+		{"Tags", formatTags(m.host.Tags)},
+	}
+
+	// Render each section
+	for _, section := range sections {
+		// Label style
+		labelStyle := lipgloss.NewStyle().
+			Bold(true).
+			Foreground(lipgloss.Color("39")). // Bright blue
+			Width(15).
+			AlignHorizontal(lipgloss.Right)
+
+		// Value style
+		valueStyle := lipgloss.NewStyle().
+			Foreground(lipgloss.Color("255")) // White
+
+		// If value is empty or default, use a muted style
+		if section.value == "Not set" || section.value == "22" && section.label == "Port" {
+			valueStyle = valueStyle.Foreground(lipgloss.Color("243")) // Gray
+		}
+
+		line := lipgloss.JoinHorizontal(
+			lipgloss.Top,
+			labelStyle.Render(section.label+":"),
+			" ",
+			valueStyle.Render(section.value),
+		)
+		b.WriteString(line)
+		b.WriteString("\n")
+	}
+
+	b.WriteString("\n")
+
+	// Action instructions
+	helpStyle := lipgloss.NewStyle().
+		Foreground(lipgloss.Color("243")).
+		Italic(true)
+
+	b.WriteString(helpStyle.Render("Actions:"))
+	b.WriteString("\n")
+
+	actionStyle := lipgloss.NewStyle().
+		Foreground(lipgloss.Color("120")). // Green
+		Bold(true)
+
+	b.WriteString("  ")
+	b.WriteString(actionStyle.Render("e/Enter"))
+	b.WriteString(helpStyle.Render(" - Switch to edit mode"))
+	b.WriteString("\n")
+
+	b.WriteString("  ")
+	b.WriteString(actionStyle.Render("q/Esc"))
+	b.WriteString(helpStyle.Render(" - Return to host list"))
+
+	// Wrap in a border for better visual separation
+	content := b.String()
+
+	borderStyle := lipgloss.NewStyle().
+		Border(lipgloss.RoundedBorder()).
+		BorderForeground(lipgloss.Color("39")).
+		Padding(1).
+		Margin(1)
+
+	// Center the info window
+	return lipgloss.Place(
+		m.width,
+		m.height,
+		lipgloss.Center,
+		lipgloss.Center,
+		borderStyle.Render(content),
+	)
+}
+
+// Helper functions for formatting values
+
+func formatOptionalValue(value string) string {
+	if value == "" {
+		return "Not set"
+	}
+	return value
+}
+
+func formatSSHOptions(options string) string {
+	if options == "" {
+		return "Not set"
+	}
+	return options
+}
+
+func formatTags(tags []string) string {
+	if len(tags) == 0 {
+		return "Not set"
+	}
+	return strings.Join(tags, ", ")
+}
+
+// Standalone wrapper for info form (for testing or standalone use)
+type standaloneInfoForm struct {
+	*infoFormModel
+}
+
+func (m standaloneInfoForm) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
+	switch msg.(type) {
+	case infoFormCancelMsg:
+		return m, tea.Quit
+	case infoFormEditMsg:
+		// For standalone mode, just quit - parent should handle edit transition
+		return m, tea.Quit
+	}
+
+	newForm, cmd := m.infoFormModel.Update(msg)
+	m.infoFormModel = newForm
+	return m, cmd
+}
+
+// RunInfoForm provides a standalone info form for testing
+func RunInfoForm(hostName string, configFile string) error {
+	styles := NewStyles(80)
+	infoForm, err := NewInfoForm(hostName, styles, 80, 24, configFile)
+	if err != nil {
+		return err
+	}
+	m := standaloneInfoForm{infoForm}
+
+	p := tea.NewProgram(m, tea.WithAltScreen())
+	_, err = p.Run()
+	return err
+}