0.0.15

• Sift now installs the tools it needs (yt-dlp, ffmpeg, Deno) automatically on first run — no manual setup step.
• Those tools now keep themselves up to date: on launch, an outdated tool updates silently in the background. A toggle in Settings → Binaries switches this to notify-only if you'd rather approve each update.
• A small toast shows when a tool is installing/updating or when an update is available.
• Fixed ffmpeg update detection — it previously could never tell that a newer ffmpeg build existed. (After this update, ffmpeg may refresh itself once as it moves to the new build-date versioning — expected, not a problem.)