Add offline-first task-master TUI with tickets, board lists, and undo.

Charm-based CLI with JSON persistence, status/list filters, external editor editing, command-history undo/redo, and glamour markdown without AutoStyle OSC hangs.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/ui/layout.go

@@ -0,0 +1,70 @@
+package ui
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/charmbracelet/lipgloss"
+
+	"task/internal/config"
+)
+
+func (m Model) renderHeader() string {
+	brand := m.styles.HeaderBrand.Render(config.AppName)
+	project := m.styles.HeaderMeta.Render(fmt.Sprintf("project: %s", m.cfg.ActiveProject))
+	board := m.styles.FilterHint.Render(fmt.Sprintf("list: %s", m.boardList.Label()))
+	count := m.styles.HeaderMeta.Render(fmt.Sprintf("%d tickets", m.ticketCount()))
+
+	parts := []string{brand, project, board, count}
+	if m.filter != "" {
+		parts = append(parts, m.styles.FilterHint.Render(fmt.Sprintf("filter: %q", m.filter)))
+	}
+	if m.status != "" {
+		style := m.styles.StatusMsg
+		if m.statusIsError {
+			style = m.styles.ErrorMsg
+		}
+		parts = append(parts, style.Render(m.status))
+	}
+
+	line := strings.Join(parts, m.styles.HeaderMeta.Render("  │  "))
+	return m.styles.Header.Width(m.width).Render(line)
+}
+
+func (m Model) renderBody(height int) string {
+	if height < 1 {
+		height = 1
+	}
+
+	switch m.mode {
+	case ModeCreate:
+		label := "New ticket:"
+		if m.creatingProject {
+			label = "New project:"
+		}
+		prompt := m.styles.InputPrompt.Render(label)
+		content := prompt + "\n" + m.input.View()
+		return lipgloss.NewStyle().Height(height).Width(m.width).Render(content)
+
+	case ModeSearch:
+		prompt := m.styles.InputPrompt.Render("Search:")
+		content := prompt + "\n" + m.input.View()
+		return lipgloss.NewStyle().Height(height).Width(m.width).Render(content)
+
+	case ModeProjects:
+		m.projectList.SetSize(m.width, height)
+		return m.projectList.View()
+
+	case ModeStatus:
+		menu := m.statusMenu.View()
+		return lipgloss.NewStyle().Height(height).Width(m.width).Render(menu)
+
+	case ModeBoard:
+		menu := m.boardMenu.View()
+		return lipgloss.NewStyle().Height(height).Width(m.width).Render(menu)
+
+	default:
+		m.tickets.SetSize(m.width, height)
+		return m.tickets.View()
+	}
+}