Enable nullable for enum localize classes & Bump version to 0.0.5

[Jack251970]

Enable nullable for enum localize classes

Follow on with #38.

#38 introduces INotifyPropertyChanged which contains nullable type ? usage. So we should enable nullable for enum localize classes. Or it will lead to VS build warning:

Bump version to v0.0.5

Version bump for test release.

[Copilot]

Pull Request Overview

This PR enables nullable reference types for enum localize classes and bumps the package version to 0.0.5. The changes address build warnings that occur when nullable reference types are used with INotifyPropertyChanged from a previous PR (#38).

• Enable nullable reference types in generated enum localize classes
• Update version numbers from 0.0.4 to 0.0.5 across all version properties

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
Flow.Launcher.Localization.csproj	Version bump to 0.0.5 for package release
EnumSourceGenerator.cs	Enable nullable context and add nullable annotations to string properties

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