[Bug] Mond Moon Illumination Fraction is jumping

### Short summary 📝 Moon Illumination Fraction shows stepped values/plateaus instead of continuous curve ### Detailed description 📋 **Description:** The moon_illumination_fraction does not update continuously. Instead of a smooth transition reflecting the astronomical reality, the values remain static for several days (forming horizontal plateaus in charts) and then jump abruptly to a new value. For example, the value jumped from approximately 95% to 66% on March 9th without any intermediate data points. Additionally, the reported values appear to be outdated. On March 14, 2026, the sensor reported 66.10%, while the actual astronomical illumination was significantly lower (approx. 18%). **Steps to Reproduce:** Monitor the moon_illumination_fraction over a period of 48–72 hours. Observe the state history/charting. Compare the output value with real-time astronomical data. **Expected Behavior:** The illumination fraction should update incrementally (approx. 0.2% to 0.5% change per hour) to form a continuous, smooth curve. **Actual Behavior:** The value remains identical for long periods and then performs a vertical "jump" to a much later state, skipping all intermediate percentages. **Screenshot:** <img width="2296" height="418" alt="Image" src="https://github.com/user-attachments/assets/63e81a71-8ff1-4bfa-9bec-a4dbdb25d9d3" /> Additionally: The float value should not need this precision: <img width="560" height="498" alt="Image" src="https://github.com/user-attachments/assets/4e6983b0-ed4b-4663-95e1-f401ac0c6e26" /> ### Version 📌 _No response_ ### Environment 🌐 home assistant ### Logs and screenshots 📂 _No response_