This pull request adds support for the Arc browser to both the backend
maintained apps and the frontend software icons. The main changes
include adding Arc's metadata and install/uninstall scripts, updating
the apps listing, and providing a new SVG icon for Arc in the frontend.
**Backend: Arc browser support**
* Added Arc's metadata to `arc.json`, including its identifier,
installer format, and default categories.
* Created `arc/darwin.json` with version info, install/uninstall
scripts, and installer details for Arc on macOS.
* Updated `apps.json` to include Arc in the list of supported apps, with
a user-friendly description.
**Frontend: Arc browser icon**
* Added a new SVG icon component for Arc in `Arc.tsx`.
* Registered Arc in the icon index and mapped its name to the new icon
for use in the software page.
[[1]](diffhunk://#diff-628095892e1d16090be1db6cc1a5c9cebc65248c32a8b1312385394818f2907bR18)
[[2]](diffhunk://#diff-628095892e1d16090be1db6cc1a5c9cebc65248c32a8b1312385394818f2907bR175)
