feat: system language + navigation

[l2hyunwoo]

[Copilot]

Pull request overview

This PR adds system language detection and Android navigation mode detection capabilities to the device info module. The new features provide access to the device's system language in BCP 47 format and the Android navigation mode (gesture, 2-button, or 3-button).

• Added systemLanguage property to get device language in BCP 47 format on both iOS and Android
• Added navigationMode property to detect Android navigation mode (returns 'unknown' on iOS)
• Updated documentation with comprehensive examples and usage patterns

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/DeviceInfo.nitro.ts	Added NavigationMode type and interface properties for systemLanguage and navigationMode
ios/DeviceInfo.swift	Implemented systemLanguage using Locale.preferredLanguages and navigationMode returning 'unknown'
android/src/main/java/com/margelo/nitro/nitrodeviceinfo/DeviceInfo.kt	Implemented systemLanguage using Locale and navigationMode using Settings.Secure
example/showcase/src/types/index.ts	Added LOCALIZATION_NAVIGATION category enum
example/showcase/src/config/propertyCategories.ts	Added property configurations for new features
docs/docs/api/types.md	Added NavigationMode type documentation with examples
docs/docs/api/device-info.md	Added comprehensive documentation for both new properties
example/showcase/ios/Podfile.lock	Updated NitroDeviceInfo version from 1.1.0 to 1.2.1

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