feat(06-02): create Go→TypeScript event constant codegen tool

- Add backend/events/cmd/genevents/main.go using go/ast for deterministic output
- Add //go:generate directive to backend/events/events.go
- Generate frontend/src/events.ts with all 21 constants including LibraryConfigChanged
- Atomic file writes via temp file + rename
- Comment groups preserved with trailing period stripping

frontend/src/events.ts

@@ -1,5 +1,4 @@
-// Centralized event name constants for Wails frontend/backend communication.
-// These names must match the corresponding event names in the Go backend.
+// Code generated by genevents from backend/events/events.go. DO NOT EDIT.
 
 export const Events = {
     // Playback events (backend → frontend push)
@@ -15,6 +14,12 @@ export const Events = {
     QueueModeChanged: "QueueModeChanged",
     QueueTracksModified: "QueueTracksModified",
 
+    // Config events
+    LibraryConfigChanged: "LibraryConfigChanged",
+    ThemeConfigChanged: "ThemeConfigChanged",
+    TrackListConfigChanged: "TrackListConfigChanged",
+    FavoritesConfigChanged: "FavoritesConfigChanged",
+
     // Playlist events
     PlaylistCreated: "PlaylistCreated",
     PlaylistDeleted: "PlaylistDeleted",
@@ -23,11 +28,6 @@ export const Events = {
     PlaylistsRestored: "PlaylistsRestored",
     DefaultPlaylistChanged: "DefaultPlaylistChanged",
 
-    // Config events
-    ThemeConfigChanged: "ThemeConfigChanged",
-    TrackListConfigChanged: "TrackListConfigChanged",
-    FavoritesConfigChanged: "FavoritesConfigChanged",
-
     // Library events
     LibraryScanStarted: "LibraryScanStarted",
     LibraryScanComplete: "LibraryScanComplete",