gui: ship SIL OFL 1.1 license for bundled Noto Sans

Required by the OFL for redistribution. Installs alongside the
existing MIT and Apache-2.0 license files in the Arch package.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

packaging/arch/PKGBUILD

@@ -9,7 +9,7 @@ pkgrel=1
 pkgdesc='P2P screen sharing over iroh — no port forwarding, no signup'
 arch=('x86_64')
 url='file:///home/mollusk/git/butter/pixelpass'
-license=('MIT' 'Apache-2.0')
+license=('MIT' 'Apache-2.0' 'OFL-1.1')
 depends=(
   'gstreamer'          # gst-launch-1.0 / gst-inspect-1.0
   'gst-plugins-base'   # videoscale (quality-preset downscale)
@@ -60,4 +60,6 @@ package() {
   install -Dm0644 README.md "$pkgdir/usr/share/doc/$pkgname/README.md"
   install -Dm0644 LICENSE-MIT "$pkgdir/usr/share/licenses/$pkgname/LICENSE-MIT"
   install -Dm0644 LICENSE-APACHE "$pkgdir/usr/share/licenses/$pkgname/LICENSE-APACHE"
+  install -Dm0644 assets/NotoSans-OFL.txt \
+    "$pkgdir/usr/share/licenses/$pkgname/NotoSans-OFL.txt"
 }