Update runtime to GNOME 48 and fix various bugs.

• Remove hidden formats logic to improve discoverability.
• Fix broken inspiration links.
• Fix panic when handling files without extenstions.
• Exit gracefully when drag-and-dropped unsupported files.
• Keep input images unique instead of duplicating them.
• Display helpful message when ghostscript or zip isn't available.
• Support HEIC and HEIF images with animations.
• Only load previews for a few files and with a maximum pixel count.
• Do not produce alpha channel when not necessary.
• Rewrite bactch naming logic to produce fewer errors.

Dependencies have been updated to the latest versions.