feat: Task 15 — TUI Tab Framework + Orange Theme

- pkg/tui/styles.go — orange theme palette and component styles
- pkg/tui/tabs.go — Tab interface + TabManager with add/close/next/prev
- pkg/tui/host_list_tab.go — HostListTab implementing Tab interface
- pkg/tui/tui.go — refactored to use TabManager (backward compatible)
- pkg/tui/host_list.go — removed (logic moved to host_list_tab.go)
- pkg/tui/tui_test.go — adapted + added TabManager tests

pkg/tui/tui.go

@@ -2,22 +2,11 @@ package tui
 
 import (
 	tea "github.com/charmbracelet/bubbletea"
-	"github.com/charmbracelet/lipgloss"
 
 	"git.tukangketik.id/swanadiva/hostkeeper/internal/models"
 )
 
-// Styles for TUI components
-var (
-	TitleStyle     = lipgloss.NewStyle().Foreground(lipgloss.Color("86")).Bold(true)
-	SubtitleStyle  = lipgloss.NewStyle().Foreground(lipgloss.Color("241"))
-	HighlightStyle = lipgloss.NewStyle().Foreground(lipgloss.Color("212")).Bold(true)
-	ErrorStyle     = lipgloss.NewStyle().Foreground(lipgloss.Color("196")).Bold(true)
-	SuccessStyle   = lipgloss.NewStyle().Foreground(lipgloss.Color("76")).Bold(true)
-	InfoStyle      = lipgloss.NewStyle().Foreground(lipgloss.Color("117"))
-)
-
-// Screen represents different TUI screens
+// Screen represents different TUI screens (deprecated, use tabs)
 type Screen int
 
 const (
@@ -28,16 +17,21 @@ const (
 
 // Model represents the main TUI model
 type Model struct {
-	CurrentScreen Screen
-	Hosts         []*models.Host
-	SelectedIndex int
+	tabs          *TabManager
+	CurrentScreen Screen // deprecated, kept for backward compat
+	Hosts         []*models.Host // deprecated
+	SelectedIndex int // deprecated
 	Error         error
 	Quit          bool
 }
 
 // New creates a new TUI model
 func New() *Model {
+	hostList := NewHostListTab()
+	tm := NewTabManager(hostList)
+
 	return &Model{
+		tabs:          tm,
 		CurrentScreen: ScreenHostList,
 		SelectedIndex: 0,
 		Quit:          false,
@@ -46,7 +40,7 @@ func New() *Model {
 
 // Init initializes the TUI
 func (m *Model) Init() tea.Cmd {
-	return nil
+	return m.tabs.Init()
 }
 
 // Update handles messages and updates the model
@@ -57,45 +51,50 @@ func (m *Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		case "ctrl+c", "q":
 			m.Quit = true
 			return m, tea.Quit
-
-		case "up", "k":
-			if m.SelectedIndex > 0 {
-				m.SelectedIndex--
-			}
-
-		case "down", "j":
-			if m.SelectedIndex < len(m.Hosts)-1 {
-				m.SelectedIndex++
-			}
-
-		case "enter", " ":
-			if len(m.Hosts) > 0 {
-				return m, tea.Quit
-			}
 		}
 	}
 
-	return m, nil
+	cmd, err := m.tabs.Update(msg)
+	if err != nil {
+		m.Error = err
+	}
+
+	// Sync deprecated fields
+	if ht := FindHostListTab(m.tabs.tabs); ht != nil {
+		m.Hosts = ht.Hosts()
+		m.SelectedIndex = ht.SelectedIndex()
+	}
+
+	return m, cmd
 }
 
 // View renders the TUI
 func (m *Model) View() string {
 	if m.Quit {
+		m.tabs = nil
 		return "Thanks for using hostkeeper!\n"
 	}
 
-	switch m.CurrentScreen {
-	case ScreenHostList:
-		return renderHostList(m)
-	default:
-		return "Screen not implemented yet"
+	if m.tabs == nil || m.tabs.Len() == 0 {
+		return "No tabs open. Press 'q' to quit.\n"
 	}
+
+	return m.tabs.View()
 }
 
 // LoadHosts loads hosts into the TUI model
 func (m *Model) LoadHosts(hosts []*models.Host) {
-	m.Hosts = hosts
-	if len(hosts) > 0 && m.SelectedIndex >= len(hosts) {
-		m.SelectedIndex = len(hosts) - 1
+	if m.tabs == nil {
+		return
+	}
+
+	if ht := FindHostListTab(m.tabs.tabs); ht != nil {
+		ht.SetHosts(hosts)
+		m.Hosts = hosts
 	}
 }
+
+// TabManager returns the underlying tab manager
+func (m *Model) TabManager() *TabManager {
+	return m.tabs
+}