reminders: confirm from the row, not from the sentence (V-507)

The confirmation was phrased by the replier off Slots.Text, so it named
whatever hour the utterance contained — including one the parser rejected
or read differently. He heard 'напомню в семь' with no row at seven, and
stopped thinking about it.

actionReminder now phrases it itself from the stored fire time, so the
sentence and the row cannot disagree. Deterministic: the one sentence that
must match a database row is not one to hand to a 1.7B.

Also fixes formatTime, which had t.Format("2 января") — Go reads that as a
literal, so every fact older than a day read as January. The month comes
from internal/lexicon now, which is where months live.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

cmd/mavend/actions_reminder.go

@@ -2,8 +2,11 @@ package main
 
 import (
 	"context"
+	"fmt"
 	"log"
+	"time"
 
+	"github.com/kami/maven/internal/lexicon"
 	"github.com/kami/maven/internal/phraser"
 	"github.com/kami/maven/internal/router"
 )
@@ -33,5 +36,24 @@ func (h *reactiveHandler) actionReminder(ctx context.Context, dec router.Decisio
 		log.Printf("voice: create reminder: %v", err)
 		return phraser.Ack(phraser.FailReminder, nil)
 	}
-	return ""
+	// Phrased from the row, never from the utterance (Vikunja #507). The
+	// replier only ever saw Slots.Text, so it named whatever hour the sentence
+	// contained — including one the parser had rejected or read differently.
+	// A confirmation naming an hour no row holds is worse than a clarify,
+	// because he stops thinking about it.
+	return reminderConfirm(dec.Slots.Time, h.now())
+}
+
+// reminderConfirm — the confirmation for a reminder that exists, naming the
+// stored fire time. Deterministic on purpose: the one sentence that must match
+// a database row is not one to hand to a 1.7B.
+func reminderConfirm(fire, now time.Time) string {
+	when := dayPrefix(now, fire)
+	if when == "это" {
+		// Further out than the day words reach — say the date instead of a
+		// word that would be wrong.
+		date := fmt.Sprintf("%d %s", fire.Day(), lexicon.MonthGenitive(int(fire.Month())))
+		return "хорошо, напомню " + date + " в " + fire.Format("15:04") + "."
+	}
+	return "хорошо, напомню " + when + " в " + fire.Format("15:04") + "."
 }

cmd/mavend/reactive_notes_test.go

@@ -44,9 +44,12 @@ func TestReactiveNotesReminders(t *testing.T) {
 				HasTime: true,
 			},
 		}
+		// The confirmation is phrased from the row now (Vikunja #507), so it
+		// names the stored hour rather than leaving the replier to read one
+		// out of the sentence.
 		reply := h.applyAction(ctx, dec)
-		if reply != "" {
-			t.Errorf("expected empty reply from applyAction, got %q", reply)
+		if want := "хорошо, напомню завтра в " + fireAt.Format("15:04") + "."; reply != want {
+			t.Errorf("reply = %q, want %q", reply, want)
 		}
 		reminders, err := st.ListReminders(ctx, 10)
 		if err != nil {

cmd/mavend/reminder_confirm_test.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"strings"
+	"testing"
+	"time"
+)
+
+// A reminder confirmation is the one sentence that must match a database row.
+// It used to be phrased by the replier from Slots.Text, which meant it named
+// whatever hour the sentence contained — including an hour the parser had
+// rejected or read differently (Vikunja #507).
+
+func TestReminderConfirmNamesTheStoredHour(t *testing.T) {
+	now := time.Date(2026, 8, 5, 9, 0, 0, 0, time.UTC)
+	got := reminderConfirm(now.Add(10*time.Hour), now) // 19:00 today
+	if !strings.Contains(got, "19:00") {
+		t.Fatalf("confirmation = %q, want the stored 19:00 in it", got)
+	}
+	if !strings.Contains(got, "сегодня") {
+		t.Fatalf("confirmation = %q, want it to say сегодня", got)
+	}
+}
+
+func TestReminderConfirmUsesADateBeyondTheDayWords(t *testing.T) {
+	// dayPrefix answers "это" past послезавтра, and "напомню это в 09:00" is
+	// not a sentence. A date is.
+	now := time.Date(2026, 8, 5, 9, 0, 0, 0, time.UTC)
+	got := reminderConfirm(now.Add(10*24*time.Hour), now)
+	if strings.Contains(got, "это") {
+		t.Fatalf("confirmation = %q, want a date rather than the fallback day word", got)
+	}
+	if !strings.Contains(got, "15 августа") {
+		t.Fatalf("confirmation = %q, want the date in it", got)
+	}
+}
+
+func TestReminderConfirmIsFeminineAndInformal(t *testing.T) {
+	// The persona checks the phrasing eval enforces apply here too, and this
+	// sentence never passes through a phraser.
+	now := time.Date(2026, 8, 5, 9, 0, 0, 0, time.UTC)
+	got := reminderConfirm(now.Add(time.Hour), now)
+	for _, bad := range []string{"вы", "ваш", "напомнил ", "рад "} {
+		if strings.Contains(strings.ToLower(got), bad) {
+			t.Fatalf("confirmation = %q contains %q", got, bad)
+		}
+	}
+	if !strings.HasPrefix(got, "хорошо, напомню") {
+		t.Fatalf("confirmation = %q, want it to open with the promise", got)
+	}
+}

cmd/mavend/ruwords.go

@@ -165,6 +165,8 @@ func formatTime(t time.Time) string {
 		n := int(diff.Hours())
 		return fmt.Sprintf("%d %s назад", n, say.CountWord(n, "час", "часа", "часов"))
 	default:
-		return t.Format("2 января 15:04")
+		// Not t.Format("2 января …"): Go reads that as a literal, so every
+		// fact older than a day used to read as January (Vikunja #507).
+		return fmt.Sprintf("%d %s %s", t.Day(), lexicon.MonthGenitive(int(t.Month())), t.Format("15:04"))
 	}
 }