reminders: add ListReminders IPC + /reminders web page

Store layer: ListReminders returns the n most recent reminders
(newest first). IPC: new MethodListReminders wired through server,
client, and lockedAPI. Web: /reminders page with table of created
time, fire time, status badge, and payload text; empty state with
prompt to ask maven for a reminder. Sidebar entry under Automation.

internal/ipc/server.go

@@ -78,6 +78,18 @@ func (a *storeAPI) MarkReminder(ctx context.Context, id int64, status string) er
 	return mapErr(a.s.MarkReminder(ctx, id, status))
 }
 
+func (a *storeAPI) ListReminders(ctx context.Context, n int) ([]Reminder, error) {
+	rs, err := a.s.ListReminders(ctx, n)
+	if err != nil {
+		return nil, mapErr(err)
+	}
+	out := make([]Reminder, len(rs))
+	for i, r := range rs {
+		out[i] = toReminder(r)
+	}
+	return out, nil
+}
+
 func (a *storeAPI) RescheduleReminder(ctx context.Context, id int64, now time.Time) error {
 	return mapErr(a.s.RescheduleReminder(ctx, id, now))
 }
@@ -210,6 +222,18 @@ func toTool(t store.Tool) Tool {
 	}
 }
 
+func toReminder(r store.Reminder) Reminder {
+	return Reminder{
+		ID:         r.ID,
+		CreatedTs:  r.CreatedTs,
+		FireTs:     r.FireTs,
+		NextFireTs: r.NextFireTs,
+		Payload:    r.Payload,
+		Status:     r.Status,
+		Cron:       r.Cron,
+	}
+}
+
 func toNote(n store.Note) Note {
 	return Note{ID: n.ID, Ts: n.Ts, Text: n.Text, Source: n.Source, Score: n.Score}
 }
@@ -516,6 +540,20 @@ func (s *Server) dispatch(ctx context.Context, req Request) (json.RawMessage, er
 		err := api.MarkReminder(ctx, p.ID, p.Status)
 		return marshalResult(nil), err
 
+	case MethodListReminders:
+		var p nReq
+		if err := unmarshalParams(req.Params, &p); err != nil {
+			return nil, err
+		}
+		out, err := api.ListReminders(ctx, p.N)
+		if err != nil {
+			return nil, err
+		}
+		if out == nil {
+			out = []Reminder{}
+		}
+		return marshalResult(out), nil
+
 	case MethodRecordNudge:
 		var p recordNudgeReq
 		if err := unmarshalParams(req.Params, &p); err != nil {