Predefine build name on character import.

[n1tr0xs]

Fixes #8146 . Fixes #3448 .

Description of the problem being solved:

Added build name predefinition on character import using this template: "%accountName - %characterName" It saves predefined name to main.predefinedBuildName and propose it to user in save prompt.

Steps taken to verify a working solution:

• Import Passive Tree or Items
• Click "Save"
• Check edit field.

Before screenshot:

After screenshot:

Short video:

https://github.com/user-attachments/assets/089c03ce-9f7d-4f42-b13c-67316c2d9951