Vendor Icon Refresh

This project vendors icon assets from homarr-labs/dashboard-icons into:

After refreshing the vendored files, regenerate the searchable manifest:

pnpm run icons:manifest

Then verify:

src/lib/config/vendorIconManifest.ts changed as expected
third_party/homarr-dashboard-icons/SOURCE.txt has the new upstream commit/date
third_party/homarr-dashboard-icons/LICENSE still matches upstream