Issue #3534314: Add search functionality to /media/add/unsplash
- Added autocomplete search to the Unsplash ID field on media add form
- Added autocomplete search to the Unsplash ID field on media edit form
- Added placeholder text to guide users
- Reuses existing autocomplete route from media library implementation
Co-Authored-By: Claude noreply@anthropic.com
Closes #3534314