feat(mail): one layout for all mails with logo, greeting, cards and footer

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/storage/thoughts.go

@@ -604,6 +604,7 @@ type DueTaskAlarm struct {
 	DueDate             string
 	Priority            string
 	UserEmail           string
+	UserName            string
 	AlarmChannels       []string
 	AlarmEmail          string
 	DiscordWebhookURL   string
@@ -614,7 +615,7 @@ type DueTaskAlarm struct {
 func (s *Store) GetDueTasksForAlarm() ([]DueTaskAlarm, error) {
 	rows, err := s.db.Query(
 		`SELECT t.id, t.user_id, t.content, t.notes, t.due_date, t.priority,
-		        u.email, u.alarm_channels, u.alarm_email, u.discord_webhook_url, u.custom_webhook_url, u.notify_before_minutes
+		        u.email, u.display_name, u.alarm_channels, u.alarm_email, u.discord_webhook_url, u.custom_webhook_url, u.notify_before_minutes
 		 FROM thoughts t
 		 JOIN users u ON u.id = t.user_id
 		 WHERE (t.status = 'kept' OR (t.status = 'converted' AND t.converted_type = 'task'))
@@ -634,7 +635,7 @@ func (s *Store) GetDueTasksForAlarm() ([]DueTaskAlarm, error) {
 		var channelsRaw string
 		if err := rows.Scan(
 			&a.TaskID, &a.UserID, &a.Title, &a.Notes, &a.DueDate, &a.Priority,
-			&a.UserEmail, &channelsRaw, &a.AlarmEmail, &a.DiscordWebhookURL, &a.CustomWebhookURL, &a.NotifyBeforeMinutes,
+			&a.UserEmail, &a.UserName, &channelsRaw, &a.AlarmEmail, &a.DiscordWebhookURL, &a.CustomWebhookURL, &a.NotifyBeforeMinutes,
 		); err == nil {
 			a.AlarmChannels = parseAlarmChannels(channelsRaw)
 			if a.AlarmEmail == "" {