Announce finished and failed downloads in the background (M10)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

internal/config/config.go

@@ -32,6 +32,11 @@ type UI struct {
 	// Posters of titles that are not in the library yet are downloaded from
 	// the public image hosts Radarr/Sonarr point to (TMDb, TheTVDB).
 	Covers *bool `json:"covers,omitempty"`
+	// NotifyDownloads shows a popup (and logs it) when a SABnzbd download
+	// finishes or fails, whichever view is open (default true).
+	NotifyDownloads *bool `json:"notify_downloads,omitempty"`
+	// Bell also rings the terminal bell for those notifications (default false).
+	Bell bool `json:"bell,omitempty"`
 	// CoverStyle selects the block characters posters are drawn with:
 	// "quadrant" (2x2 pixels per cell, every font has the glyphs), "sextant"
 	// (2x3, sharper, needs a font with the Symbols for Legacy Computing
@@ -40,6 +45,9 @@ type UI struct {
 	CoverStyle string `json:"cover_style,omitempty"`
 }
 
+// ShouldNotifyDownloads reports whether finished downloads are announced.
+func (u UI) ShouldNotifyDownloads() bool { return u.NotifyDownloads == nil || *u.NotifyDownloads }
+
 // ShowCovers reports whether poster thumbnails are enabled.
 func (u UI) ShowCovers() bool { return u.Covers == nil || *u.Covers }