feat: download ffmpeg

[naaa760]

name: download Bundle ffmpeg about: ship ffmpeg with the app title: "Feature download ffmpeg "

#1640

/claim #1640

description

Bundle ffmpeg with the app instead of downloading it at runtime. This improves the initial setup experience for non-technical users while keeping the sidecar ffmpeg as a backup for CLI usage.

Key changes:

• Add pre-build script to download the correct ffmpeg binary during the build
• Configure Tauri to bundle ffmpeg in resources
• Add FfmpegCommand struct to handle bundled/sidecar ffmpeg paths
• Update the build process to include ffmpeg download step

Related issue: # (add issue number if exists)

how to test

1. Clean build artifacts and run build:

Launch the app and test the recording functionality

The pre-build script includes detailed logging to help diagnose any issues during ffmpeg download and verification.

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[brymut]

Testing this on macos @louis030195