[🐛] `chibi update` removes "Date started", "Notes", and potentially other fields

[TheInternetUse7]

Describe the bug
When modifying a list entry using the chibi update command, the "Date started" field for that specific anime is unintentionally cleared/removed from my AniList profile.

To Reproduce
Steps to reproduce the behavior:

1. Ensure you have an active anime or manga in your AniList profile with a "Date started" already set.
2. Open PowerShell and run a command to update its progress or score, for example: chibi update <id> --progress 5 (or even without a flag).
3. Check the updated entry via the AniList website.
4. See that the "Date started" field is now completely blank/removed.

Expected behavior
The chibi update command should only update the explicitly provided fields (like progress, status, or score) and preserve existing data on the AniList servers, including the "Date started" field.

Error Message/Screenshot
No error message is displayed in the terminal. The CLI outputs a successful update message.

Desktop (please complete the following information):

• OS: Windows 11 (x64)
• Terminal Emulator: Windows Terminal (PowerShell)
• Version: 25H2

[TheInternetUse7]

after looking into it more, it's not just date started, it removes other info as well.
before:

after:

[TheInternetUse7]

also if the progress is updated to the last episode, chibi should set the current date as the completion date. i dont know if it does that already.

[CosmicPredator]

@TheInternetUse7 it does that already, but i might've send empty requests on other fields. That's why the other data fields are empty. I'll work on it!