When all available cover URLs are GIFs (coverUrl, stillCoverUrl, and
screenshots), return empty instead of a GIF URL. HTTPImageFetcher cannot
decode GIFs, so attempting to fetch one always returns null. Returning
empty early avoids unnecessary network requests and confusing log noise.
butlerd sometimes passes itch.io coverUrl/stillCoverUrl with trailing
srcset descriptors (e.g. ' 1x, h' or ' 1'). These polluted URLs cause
HTTPImageFetcher to fail because the URL is invalid and the extension
extraction breaks.
Changes:
- Add _sanitize_url() to strip srcset artifacts from URLs
- Add _is_gif_url() helper that works with both clean and polluted URLs
- Fix SCREENSHOT_REGEX_PATTERN to use [\w+/=]* instead of [^"]* to
avoid crossing srcset boundaries in HTML
- Replace all .ends_with('.gif') checks with _is_gif_url()
- Sanitize all URLs from game metadata and HTML scraping
- Add IMAGE_EXTS constant for extension validation
Also bump to v0.1.7.
