✨ Trailing Padding When Not Wrapping

### Description

When lines are not wrapped, there should be additional padding added to the trailing edge. This should probably be configurable for other consumers of this package.

Xcode and other editors add a trailing padding when not wrapping lines so there's better spacing visually on the trailing edge. I don't think this is default behavior for text views, which is why it should be either configurable or be able to be disabled. In Xcode, the padding is 48 pixels.

### Alternatives Considered

The method in https://github.com/CodeEditApp/CodeEditSourceEditor/pull/272 was considered, but this has it's own issues. This type of text layout should be in the text editor.

### Additional Context

_No response_

### Screenshots

_No response_

Start by tracing the text layout behavior when line wrapping is disabled. Determine how trailing padding can be made configurable, including the proposed 48-pixel spacing and a way to disable it, then verify the visual result in the text editor and confirm wrapped lines are unaffected.

Written by the indexing model from the issue text.