Applies preflight rulings F4, F7, F8, N5: Apply now's toast shows only
the success/info summary (the marketplace-sync-finished event listener
already toasts per-project errors/skips, so this avoids a double toast);
row removal passes the bare MarketplaceItemRef rather than the full
MarketplaceInstall; UpdateDiffModal shows a hook's rendered commands at
head above the file diff so an update is reviewed the same way an
install is.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
