Improve the "Rename note type" dialog

[dagangtj]

Fixes #20467

Changes

• ✅ Add "Name" hint to the text input field border
• ✅ Show red error text when note type already exists
• ✅ Error message: "Note type already exists"
• ✅ Clear error when input becomes valid

Implementation Details

• Added android:hint="@string/name" to TextInputLayout
• Added new string resources: name and note_type_already_exists
• Modified callback to set/clear error on TextInputLayout
• Error only shows when duplicate name is entered

Testing

• Entering an existing note type name shows red error text
• Changing to a unique name clears the error
• Button remains disabled when duplicate name is present

[welcome]

First PR! 🚀 We sincerely appreciate that you have taken the time to propose a change to AnkiDroid! Please have patience with us as we are all volunteers - we will get to this as soon as possible.

[github-actions]

Important

Maintainers: This PR contains Strings changes

1. Sync Translations before merging this PR and wait for the action to complete
2. Review and merge the auto-generated PR in order to sync all user-submitted translations
3. Sync Translations again and merge the PR so the huge automated string changes caused by merging this PR are by themselves and easy to review

[david-allison]

Hi @dagangtj, are you aware of: https://github.com/ankidroid/Anki-Android/blob/main/AI_POLICY.md

[lukstbit]

Hi @dagangtj, are you aware of: https://github.com/ankidroid/Anki-Android/blob/main/AI_POLICY.md

Most likely not.
Closing for this and that the user ignored the request to leave the PR for another dev.