fix(tauri): add missing icon.icns to bundle configuration

Fixes the 'No matching IconType' error when running 'bun run tauri build' on macOS. The .icns file format is required for macOS application bundles but was missing from the icon array in tauri.conf.json.

Addresses: https://github.com/getAsterisk/claudia/issues/37#issuecomment-3003969906

src-tauri/tauri.conf.json

@@ -38,6 +38,7 @@
       "icons/32x32.png",
       "icons/128x128.png",
       "icons/128x128@2x.png",
+      "icons/icon.icns",
       "icons/icon.png"
     ]
   }