fix(time): accept spaced durations and print whole-second times

tea time create 1 1h25m printed 2026-10-11T18:57:49.588823137Z while time
list printed whole seconds, and "1h 30m" or 2d failed with "duration
must be nonzero whole seconds". Durations may now contain spaces, and
errors name the problem: "invalid duration "2d": use h, m and s units
such as 1h25m". Tracked times are whole seconds everywhere.

Signed-off-by: bircni <bircni@icloud.com>

internal/app/time_test.go

@@ -8,6 +8,7 @@ import (
 	"net/http"
 	"testing"
 
+	"gitea.dev/tea/internal/clierr"
 	"github.com/stretchr/testify/require"
 )
 
@@ -29,3 +30,30 @@ func TestTimeListShowsRepositoryAndDurations(t *testing.T) {
 	require.NoError(t, Execute(context.Background(), deps, []string{"time", "list", "--mine", "--json=repository,issue_number"}))
 	require.JSONEq(t, `[{"repository":"alice/project","issue_number":3},{"repository":"bob/tools","issue_number":3}]`, out.String())
 }
+
+func TestTimeCreateReadsDurationsAndWholeSecondTimes(t *testing.T) {
+	var seconds []string
+	server := newAuthenticatedServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		require.Equal(t, "POST /api/v1/repos/alice/project/issues/1/times", r.Method+" "+r.URL.Path)
+		seconds = append(seconds, payloadField(t, r, "time"))
+		_, _ = w.Write([]byte(`{"id":5,"time":5400,"created":"2026-10-11T18:57:49.588823137Z","user_name":"alice"}`))
+	}))
+	defer server.Close()
+	deps, out, _ := serverDeps(t, server.URL)
+	for _, duration := range []string{"1h30m", "1h 30m", " 90m "} {
+		out.Reset()
+		require.NoError(t, Execute(context.Background(), deps, []string{"time", "create", "1", duration, "-R", "alice/project", "--json=created_at"}))
+		require.JSONEq(t, `{"created_at":"2026-10-11T18:57:49Z"}`, out.String())
+	}
+	require.Equal(t, []string{"5400", "5400", "5400"}, seconds)
+	for duration, want := range map[string]string{
+		"2d":   `invalid duration "2d": use h, m and s units such as 1h25m`,
+		"0m":   `invalid duration "0m": time spent must be positive`,
+		"1.5s": `invalid duration "1.5s": use whole seconds`,
+	} {
+		err := Execute(context.Background(), deps, []string{"time", "create", "1", duration, "-R", "alice/project"})
+		require.Equal(t, clierr.Usage, clierr.ExitCode(err), duration)
+		require.ErrorContains(t, err, want)
+	}
+	require.Len(t, seconds, 3)
+}