Fix Linux packaging by specifying executable name

Add executableName to packagerConfig to ensure consistent binary naming
across platforms. Fixes DEB and RPM maker errors on Linux.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

forge.config.js

@@ -1,6 +1,7 @@
 module.exports = {
   packagerConfig: {
     asar: true,
+    executableName: 'skitch-controller',
   },
   rebuildConfig: {},
   makers: [