Add Spotify integration, Next button navigation, and UI improvements

- Added Spotify links to all album cards with official green styling
- Implemented Next Album button for sequential navigation (albums 1-499)
- Fixed jump-to-rank to scroll to album card top instead of centering
- Moved share button to same row as album status for better layout
- Improved mobile UI: fixed theme selector overlap, full-width filter controls
- Grouped sort dropdown with reverse button for logical organization
- Updated README with new features and Spotify integration details
- Enhanced vertical alignment of status badges and share buttons
- Refined button sizing and spacing for consistent appearance

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

extract_spotify_urls.py

@@ -18,8 +18,8 @@ import base64
 from typing import Dict, Optional
 
 # Spotify API credentials (you'll need to get these from Spotify Developer Dashboard)
-CLIENT_ID = "your_client_id_here"
-CLIENT_SECRET = "your_client_secret_here"
+CLIENT_ID = "7b82a80e9292465e8e778f0e5fc6f017"
+CLIENT_SECRET = "dacbe619d3c849c48e1b01dffaf89b53"
 
 def get_spotify_access_token() -> Optional[str]:
     """Get access token from Spotify API"""
@@ -190,4 +190,4 @@ def main():
         print(f"  - failed_spotify_searches.txt")
 
 if __name__ == "__main__":
-    main()
+    main()