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/report_test.go

@@ -0,0 +1,72 @@
+package ticket_test
+
+import (
+	"testing"
+	"time"
+
+	"task/internal/ticket"
+)
+
+func TestAggregateByProject(t *testing.T) {
+	entries := []ticket.TimeEntry{
+		{TicketID: "a", ProjectID: "p1", Duration: time.Hour},
+		{TicketID: "b", ProjectID: "p1", Duration: 30 * time.Minute},
+		{TicketID: "c", ProjectID: "p2", Duration: 15 * time.Minute},
+	}
+	rows := ticket.Aggregate(entries, nil, ticket.GroupByProject)
+	if len(rows) != 2 {
+		t.Fatalf("rows=%d want 2", len(rows))
+	}
+	if rows[0].Key != "p1" || rows[0].Duration != 90*time.Minute {
+		t.Fatalf("first row: %+v", rows[0])
+	}
+	if ticket.TotalDuration(entries) != 105*time.Minute {
+		t.Fatalf("total=%v", ticket.TotalDuration(entries))
+	}
+}
+
+func TestAggregateByStatusAndTicket(t *testing.T) {
+	tickets := map[string]ticket.Ticket{
+		"a": {ID: "a", Title: "Alpha", Status: ticket.StatusTodo},
+		"b": {ID: "b", Title: "Beta", Status: ticket.StatusDone},
+	}
+	entries := []ticket.TimeEntry{
+		{TicketID: "a", Duration: time.Hour},
+		{TicketID: "b", Duration: 20 * time.Minute},
+		{TicketID: "a", Duration: 10 * time.Minute},
+	}
+
+	byStatus := ticket.Aggregate(entries, tickets, ticket.GroupByStatus)
+	if len(byStatus) != 2 {
+		t.Fatalf("status rows=%d", len(byStatus))
+	}
+
+	byTicket := ticket.Aggregate(entries, tickets, ticket.GroupByTicket)
+	if len(byTicket) != 2 {
+		t.Fatalf("ticket rows=%d", len(byTicket))
+	}
+	if byTicket[0].Label != "Alpha" || byTicket[0].Duration != 70*time.Minute {
+		t.Fatalf("top ticket: %+v", byTicket[0])
+	}
+}
+
+func TestAggregateByDay(t *testing.T) {
+	d1 := time.Date(2026, 10, 18, 10, 0, 0, 0, time.Local)
+	d2 := time.Date(2026, 10, 19, 11, 0, 0, 0, time.Local)
+	entries := []ticket.TimeEntry{
+		{Start: d1, Duration: time.Hour},
+		{Start: d2, Duration: 30 * time.Minute},
+		{Start: d1, Duration: 15 * time.Minute},
+	}
+	rows := ticket.Aggregate(entries, nil, ticket.GroupByDay)
+	if len(rows) != 2 {
+		t.Fatalf("day rows=%d", len(rows))
+	}
+	// Newest day first.
+	if rows[0].Key != "2026-10-19" {
+		t.Fatalf("first day key=%q", rows[0].Key)
+	}
+	if rows[1].Duration != 75*time.Minute {
+		t.Fatalf("older day dur=%v", rows[1].Duration)
+	}
+}