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/duration_test.go

@@ -0,0 +1,58 @@
+package ticket_test
+
+import (
+	"testing"
+	"time"
+
+	"task/internal/ticket"
+)
+
+func TestParseDurationFlexible(t *testing.T) {
+	cases := []struct {
+		in   string
+		want time.Duration
+	}{
+		{"1h30m", 90 * time.Minute},
+		{"90m", 90 * time.Minute},
+		{"1.5h", 90 * time.Minute},
+		{"2h", 2 * time.Hour},
+		{"45m", 45 * time.Minute},
+		{"30s", 30 * time.Second},
+		{"1:30", 90 * time.Minute},
+		{"  1h  ", time.Hour},
+	}
+	for _, tc := range cases {
+		got, err := ticket.ParseDurationFlexible(tc.in)
+		if err != nil {
+			t.Fatalf("%q: %v", tc.in, err)
+		}
+		if got != tc.want {
+			t.Fatalf("%q: got %v want %v", tc.in, got, tc.want)
+		}
+	}
+}
+
+func TestParseDurationFlexibleRejects(t *testing.T) {
+	for _, in := range []string{"", "abc", "1:99", "-5m"} {
+		if _, err := ticket.ParseDurationFlexible(in); err == nil {
+			t.Fatalf("%q: expected error", in)
+		}
+	}
+}
+
+func TestFormatDurationHuman(t *testing.T) {
+	cases := []struct {
+		d    time.Duration
+		want string
+	}{
+		{2*time.Hour + 15*time.Minute, "2h15m"},
+		{3 * time.Hour, "3h"},
+		{45 * time.Minute, "45m"},
+		{30 * time.Second, "30s"},
+	}
+	for _, tc := range cases {
+		if got := ticket.FormatDurationHuman(tc.d); got != tc.want {
+			t.Fatalf("%v: got %q want %q", tc.d, got, tc.want)
+		}
+	}
+}