Bundle the self-contained yt-dlp onedir runtime to avoid per-request extraction latency, explicitly use bundled Deno, and guard the packaging layout. Also fix Add window menu/reset behavior and harden diagnostics and toast lifecycle handling.
The yt-dlp binary was a PyInstaller onedir build requiring an adjacent
_internal/ directory with the Python runtime. In the Tauri .app bundle,
sidecar binaries are placed in Contents/MacOS/ while the _internal/
resource ends up in Contents/Resources/binaries/, so the bootloader
could not find Python at runtime ([PYI-...:ERROR] Failed to load
Python shared library).
Replace it with the official yt-dlp_macos standalone onefile binary
from the yt-dlp release (v2026.06.09, universal2). This is fully
self-contained — it extracts its runtime to a temp directory at
invocation — and works regardless of Tauri's bundle layout.
Removes the entire _internal/ directory (~70 MB of Python framework,
native .so/.dylib files, etc.) and the stale .gitignore entry.
NimBold