`unused_import` seems to work only for public imports

### New Issue Checklist - [x] I've Updated SwiftLint to the latest version. - [x] I've searched for [existing GitHub issues](https://github.com/realm/SwiftLint/issues). ### Bug Description `unused_import` seems to work only for public imports. If correct, it should either be fixed to work for all imports, or be documented as only working for public imports. ```swift internal import Foundation // does not trigger a violation ``` zsh: ```shell swiftlint analyze --compiler-log-path =(xcodebuild -scheme myscheme -destination "platform=macOS,arch=$(arch),variant=macos" 2>&1) ``` ### Environment * SwiftLint version: 0.63.2 * Xcode version: Xcode 26.4.1 / Build version 17E202 * Installation method used: Homebrew * Configuration file: ```yml analyzer_rules: - unused_import ``` Are you using [nested configurations](https://github.com/realm/SwiftLint#nested-configurations)? No