Fix Linux GitHub Actions packaging: correct binary name case sensitivity

- Change binary copy from 'cp Fujisan fujisan-linux/usr/bin/' to 'cp Fujisan fujisan-linux/usr/bin/fujisan'
- Resolves chmod error where packaging expected lowercase 'fujisan' but found uppercase 'Fujisan'
- Ensures consistent binary naming throughout packaging process

Author: pedgarcia

.github/workflows/build-linux.yml

@@ -122,7 +122,7 @@ jobs:
         mkdir -p fujisan-linux/usr/share/doc/fujisan
         
         # Copy binary
-        cp Fujisan fujisan-linux/usr/bin/
+        cp Fujisan fujisan-linux/usr/bin/fujisan
         
         # Create desktop file
         cat > fujisan-linux/usr/share/applications/fujisan.desktop << EOF