Add ticket time tracking with reports and entry management.

Support start/stop timer, manual durations, grouped reports, and per-ticket edit/delete of time entries with undo.

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

internal/ticket/jsontimestore_test.go

@@ -0,0 +1,71 @@
+package ticket_test
+
+import (
+	"path/filepath"
+	"testing"
+	"time"
+
+	"task/internal/ticket"
+)
+
+func TestJSONTimeStoreRoundTrip(t *testing.T) {
+	dir := t.TempDir()
+	store := ticket.NewJSONTimeStore(dir)
+
+	created, err := store.Create(ticket.TimeEntry{
+		TicketID:  "t1",
+		ProjectID: "inbox",
+		Start:     time.Now().UTC().Add(-time.Hour),
+		End:       time.Now().UTC(),
+		Duration:  time.Hour,
+		Source:    ticket.SourceManual,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if created.ID == "" {
+		t.Fatal("expected id")
+	}
+
+	list, err := store.List()
+	if err != nil || len(list) != 1 {
+		t.Fatalf("list: %v len=%d", err, len(list))
+	}
+	sum, err := store.SumByTicket("t1")
+	if err != nil || sum != time.Hour {
+		t.Fatalf("sum: %v %v", err, sum)
+	}
+
+	timer := &ticket.ActiveTimer{TicketID: "t1", ProjectID: "inbox", StartedAt: time.Now().UTC()}
+	if err := store.SaveActiveTimer(timer); err != nil {
+		t.Fatal(err)
+	}
+	loaded, err := store.LoadActiveTimer()
+	if err != nil || loaded == nil || loaded.TicketID != "t1" {
+		t.Fatalf("load timer: %v %+v", err, loaded)
+	}
+	if err := store.SaveActiveTimer(nil); err != nil {
+		t.Fatal(err)
+	}
+	if loaded, err = store.LoadActiveTimer(); err != nil || loaded != nil {
+		t.Fatalf("cleared timer: %v %+v", err, loaded)
+	}
+
+	updated := created
+	updated.Duration = 90 * time.Minute
+	if err := store.Update(updated); err != nil {
+		t.Fatal(err)
+	}
+	list, err = store.ListByTicket("t1")
+	if err != nil || len(list) != 1 || list[0].Duration != 90*time.Minute {
+		t.Fatalf("after update: %v %+v", err, list)
+	}
+
+	if err := store.Delete(created.ID); err != nil {
+		t.Fatal(err)
+	}
+	list, err = store.List()
+	if err != nil || len(list) != 0 {
+		t.Fatalf("after delete: %v len=%d path=%s", err, len(list), filepath.Join(dir, "time_entries.json"))
+	}
+}