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/command/history_test.go

@@ -0,0 +1,90 @@
+package command_test
+
+import (
+	"testing"
+
+	"task/internal/command"
+	"task/internal/ticket"
+)
+
+func TestHistoryUndoRedoCreateDelete(t *testing.T) {
+	store := ticket.NewJSONStore(t.TempDir())
+	h := command.NewHistory()
+
+	create := &command.CreateTicket{
+		Store: store,
+		Ticket: ticket.Ticket{
+			Title:     "A",
+			ProjectID: "inbox",
+			Status:    ticket.StatusTodo,
+		},
+	}
+	if err := h.Do(create); err != nil {
+		t.Fatal(err)
+	}
+	list, err := store.List("inbox")
+	if err != nil || len(list) != 1 {
+		t.Fatalf("after create: %v len=%d", err, len(list))
+	}
+
+	if err := h.Undo(); err != nil {
+		t.Fatal(err)
+	}
+	list, err = store.List("inbox")
+	if err != nil || len(list) != 0 {
+		t.Fatalf("after undo create: %v len=%d", err, len(list))
+	}
+
+	if err := h.Redo(); err != nil {
+		t.Fatal(err)
+	}
+	list, err = store.List("inbox")
+	if err != nil || len(list) != 1 {
+		t.Fatalf("after redo create: %v len=%d", err, len(list))
+	}
+
+	del := &command.DeleteTicket{Store: store, Snapshot: list[0]}
+	if err := h.Do(del); err != nil {
+		t.Fatal(err)
+	}
+	list, _ = store.List("inbox")
+	if len(list) != 0 {
+		t.Fatal("expected empty after delete")
+	}
+	if err := h.Undo(); err != nil {
+		t.Fatal(err)
+	}
+	list, _ = store.List("inbox")
+	if len(list) != 1 {
+		t.Fatal("expected restored after undo delete")
+	}
+}
+
+func TestHistoryUpdateUndo(t *testing.T) {
+	store := ticket.NewJSONStore(t.TempDir())
+	created, err := store.Create(ticket.Ticket{
+		Title: "A", ProjectID: "inbox", Status: ticket.StatusTodo,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	after := created
+	after.Status = ticket.StatusDone
+	after.Title = "B"
+
+	h := command.NewHistory()
+	if err := h.Do(&command.UpdateTicket{Store: store, Before: created, After: after}); err != nil {
+		t.Fatal(err)
+	}
+	got, _ := store.Get(created.ID)
+	if got.Status != ticket.StatusDone || got.Title != "B" {
+		t.Fatalf("got %+v", got)
+	}
+	if err := h.Undo(); err != nil {
+		t.Fatal(err)
+	}
+	got, _ = store.Get(created.ID)
+	if got.Status != ticket.StatusTodo || got.Title != "A" {
+		t.Fatalf("undo got %+v", got)
+	}
+}