Feat/smart recommendationsFeat: Unsplash Support, Wallhaven Attribution & v1.0.0 Release

[dixieflatline76]

Summary

This PR introduces full Unsplash integration, improves Wallhaven attribution, and prepares the application for the v1.0.0 release.

Key Features

• Unsplash Integration:
  • Added OAuth authentication flow for secure access.
  • Implemented full settings management (Connect/Disconnect).
  • Integrated with "Smart Fit" for resolution-aware image processing.
• Wallhaven Improvements:
  • Added metadata enrichment to fetch and display uploader attribution.
  • Added "Clear API Key" functionality.
• UI Enhancements:
  • Improved settings panel layout and visibility.
  • Optimized tray menu updates for better responsiveness.

Technical Details

• Implemented EnrichImage interface for lazy metadata fetching.
• Ensured thread-safe UI updates for tray menu operations.
• Bumped version to v1.0.0.

Verification

• Passed all unit tests.
• Manually verified Unsplash connect/disconnect flows.
• Verified correct attribution display for both providers.