[Junie]: feat: add annotations for stability in UI models

Created by: jetbrains-junie[bot]

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• 🔗 Issue: Fixes: #366
• ⚙️ Trigger: Issue

📊 Junie Summary\nThe necessary annotations @Stable and @Immutable were successfully added to various UI models and screen states within the Kotlin project, improving performance and ensuring appropriate stability in Compose Multiplatform UI. The project built successfully without errors, confirming the changes were implemented correctly. The solution is now ready for submission.