Count Sampula tester build

Install:
1. Unzip "Count Sampula-testers.zip".
2. Move "Count Sampula.app" to Applications or Desktop.
3. Open it normally.
4. Grant Screen & System Audio Recording permission when prompted, then quit and reopen the app.

Notes:
- This build is signed with Developer ID and notarized by Apple.
- Gatekeeper should accept this build normally.
- Includes LAME 3.100 for MP3 encoding. LAME is licensed under the LGPL; notices are bundled in "Count Sampula.app/Contents/Resources/ThirdParty/LAME".
- Includes yt-dlp for rights-confirmed web page audio extraction. Notices are bundled in "Count Sampula.app/Contents/Resources/ThirdParty/yt-dlp".
