feat(widget): Add widget preview for Android 15

[Moustachauve]

This commit adds support for widget previews, a feature introduced in Android 15 (Vanilla Ice Cream).

• A WidgetPreviewPublisher is added to manage the publishing of widget previews to the launcher, handling versioning to avoid unnecessary updates.
• The Glance library is updated to 1.2.0-rc01 to support the new preview APIs.
• The WledWidget now implements providePreview to render a static preview in the widget picker.
• The widget's description and name strings have been updated to be more descriptive.
• The widget's metadata (wled_widget_info.xml) has been adjusted for better sizing in the launcher.

[gemini-code-assist]

Summary of Changes

Hello @Moustachauve, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces comprehensive support for Android 15's new widget preview feature, enhancing the user experience by providing a visual representation of the WLED widget before it's placed on the home screen. It involves the creation of a dedicated publisher to efficiently manage preview updates and ensures compatibility by upgrading the underlying widget framework.

Highlights

• Android 15 Widget Previews: Added support for the new widget preview feature introduced in Android 15 (Vanilla Ice Cream), allowing users to see a static preview of the WLED widget in the launcher picker.
• Widget Preview Management: Introduced a new WidgetPreviewPublisher class to manage the publishing of widget previews to the launcher, handling versioning to prevent unnecessary updates and rate limiting.
• Glance Library Update: Updated the Glance library to version 1.2.0-rc01 to leverage the latest APIs for widget preview functionality.
• Widget Content and Metadata Enhancements: The WledWidget now implements providePreview to render a static preview, and widget description and name strings have been updated for clarity. Widget metadata (wled_widget_info.xml) was adjusted for better sizing in the launcher.

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[gemini-code-assist]

Code Review

This pull request effectively adds support for widget previews on Android 15. The implementation is clean, using a WidgetPreviewPublisher to manage the preview generation and versioning, which is a good approach to avoid unnecessary work. The Glance library update and changes to the widget's metadata and string resources are all appropriate for this new feature.

I have a couple of suggestions to improve the code's maintainability and align it more closely with best practices, particularly regarding coroutine management and the use of magic numbers.