Feature/gen ai - #709

This pull request introduces support for ML Kit GenAI-powered automation suggestions using Gemini Nano, adds a new settings toggle for GenAI automation, and makes supporting code and dependency changes. The most important changes are grouped below.

GenAI Automation Integration:

• Added GenAIAutomationService and AutomationSuggestion data class to com.sameerasw.essentials.domain.genai, implementing Gemini Nano-based automation suggestion generation and device support checks. [1] [2]
• Updated ProGuard rules to keep GenAI domain classes.

Settings UI and Repository Updates:

• Added a toggle for enabling/disabling GenAI automation in the settings UI, which is only shown if the device supports it. [1] [2]
• Added a new preference key for GenAI automation to SettingsRepository.

Build and Dependency Changes:

• Added ML Kit GenAI Prompt API, schema, and KSP compiler dependencies to app/build.gradle.kts. [1] [2]
• Enabled KSP plugin in the Gradle build.

Widget UI Consistency:

• Updated widget background color handling to use ColorProvider for improved color rendering in FavoritesWidget and QsTilesWidget. [1] [2] [3]