* Unified loading icon
* Removed loading icon on image block
* Fixed color of circle on loading icon
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Icons in image fallback and loading states now automatically adapt to the current theme (light or dark mode) for a more consistent visual experience.
- **Style**
- Updated loading, success, and error icons to support theming and improved their color assignments for better visibility in different themes.
- **Refactor**
- Replaced static icon usage across several components with dynamic, theme-aware icons to ensure consistent appearance throughout the app.
- Removed static SVG icon exports and replaced them with theme-aware icon functions for improved maintainability.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Images and icons in bookmark cards are now loaded through an image proxy for improved reliability and consistency.
- Embed blocks for GitHub, Loom, and YouTube now display banner and creator images via an image proxy service for enhanced image loading.
- **Refactor**
- Simplified backend URL handling and proxy logic for images, resulting in more efficient processing and reduced complexity.
- Consolidated image proxy middleware and services into a shared adapter module for streamlined imports and improved maintainability.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
fundon
