feat(09-01): add scan control events and cancelled metrics field

- Add LibraryScanCancelled, LibraryScanPaused, LibraryScanResumed events
- Regenerate frontend/src/events.ts via go generate
- Add Cancelled bool field to ScanMetrics struct

backend/events/events.go

@@ -28,6 +28,7 @@ const (
 	ThemeConfigChanged     = "ThemeConfigChanged"
 	TrackListConfigChanged = "TrackListConfigChanged"
 	FavoritesConfigChanged = "FavoritesConfigChanged"
+	ShortcutsConfigChanged = "ShortcutsConfigChanged"
 )
 
 // Playlist events.
@@ -46,3 +47,10 @@ const (
 	LibraryScanProgress = "LibraryScanProgress"
 	LibraryScanComplete = "LibraryScanComplete"
 )
+
+// Scan control events.
+const (
+	LibraryScanCancelled = "LibraryScanCancelled"
+	LibraryScanPaused    = "LibraryScanPaused"
+	LibraryScanResumed   = "LibraryScanResumed"
+)

backend/library/metrics.go

@@ -50,6 +50,9 @@ type ScanMetrics struct {
 	Skipped int64 `json:"skipped"`
 	Removed int64 `json:"removed"`
 
+	// Cancelled is true when the scan was stopped via CancelScan.
+	Cancelled bool `json:"cancelled"`
+
 	// Non-fatal issues encountered during scanning.
 	Warnings []ScanWarning `json:"warnings"`
 }

frontend/src/events.ts

@@ -19,6 +19,7 @@ export const Events = {
     ThemeConfigChanged: "ThemeConfigChanged",
     TrackListConfigChanged: "TrackListConfigChanged",
     FavoritesConfigChanged: "FavoritesConfigChanged",
+    ShortcutsConfigChanged: "ShortcutsConfigChanged",
 
     // Playlist events
     PlaylistCreated: "PlaylistCreated",
@@ -32,6 +33,11 @@ export const Events = {
     LibraryScanStarted: "LibraryScanStarted",
     LibraryScanProgress: "LibraryScanProgress",
     LibraryScanComplete: "LibraryScanComplete",
+
+    // Scan control events
+    LibraryScanCancelled: "LibraryScanCancelled",
+    LibraryScanPaused: "LibraryScanPaused",
+    LibraryScanResumed: "LibraryScanResumed",
 } as const;
 
 export type EventName = (typeof Events)[keyof typeof Events];