feat(workspace): format origin callout date and time when converting thought to document

internal/domain/models.go

@@ -40,6 +40,58 @@ func ExtractTags(content string) []string {
 	return tags
 }
 
+// FormatGermanDateTime formats an ISO-8601 string into "25. Okt. 2026 - 15:40 Uhr"
+func FormatGermanDateTime(isoStr string) string {
+	if isoStr == "" {
+		return ""
+	}
+	var t time.Time
+	var err error
+	formats := []string{
+		time.RFC3339Nano,
+		time.RFC3339,
+		"2006-01-02T15:04:05Z07:00",
+		"2006-01-02T15:04:05",
+		"2006-01-02 15:04:05",
+		"2006-01-02",
+	}
+	for _, f := range formats {
+		if parsed, parseErr := time.Parse(f, isoStr); parseErr == nil {
+			t = parsed
+			err = nil
+			break
+		} else {
+			err = parseErr
+		}
+	}
+	if err != nil {
+		return isoStr
+	}
+
+	t = t.Local()
+
+	germanMonths := map[time.Month]string{
+		time.January:   "Jan.",
+		time.February:  "Feb.",
+		time.March:     "März",
+		time.April:     "Apr.",
+		time.May:       "Mai",
+		time.June:      "Juni",
+		time.July:      "Juli",
+		time.August:     "Aug.",
+		time.September: "Sept.",
+		time.October:   "Okt.",
+		time.November:  "Nov.",
+		time.December:  "Dez.",
+	}
+	mStr := germanMonths[t.Month()]
+	if mStr == "" {
+		mStr = t.Format("Jan")
+	}
+
+	return fmt.Sprintf("%d. %s %d - %02d:%02d Uhr", t.Day(), mStr, t.Year(), t.Hour(), t.Minute())
+}
+
 type User struct {
 	ID                  string   `json:"id"`
 	Email               string   `json:"email"`