build: use stable local macOS signing

Ariver

2026-05-18 441f7731af05f2d5c092bca0d537a318bac7b458

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[Desktop Entry]
Type=Application
Name=VoiceSnap
Comment=Offline voice-to-text input tool
Exec=voicesnap
Icon=voicesnap
Terminal=false
Categories=Utility;AudioVideo;
Keywords=voice;speech;text;input;asr;
StartupNotify=false