feat(analytics): add custom event tracking to Storage app

Add StorageEvents helper (11 events) and integrate tracking into:
- Files store: download, delete, favorite, view mode toggle
- Shared page: share link copy/delete
- Trash page: restore, empty trash
- Search page: search performed with results count

Updates ManaScore analytics from 3/5 to 4/5 (customEvents: true).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/shared-utils/src/analytics.ts

@@ -275,6 +275,24 @@ export const ManaCoreEvents = {
 	profileUpdated: () => trackEvent('profile_updated'),
 };
 
+/**
+ * Storage App Events
+ */
+export const StorageEvents = {
+	fileDownloaded: () => trackEvent('file_downloaded'),
+	fileDeleted: () => trackEvent('file_deleted'),
+	fileFavorited: (favorited: boolean) => trackEvent('file_favorited', { favorited }),
+	folderDeleted: () => trackEvent('folder_deleted'),
+	folderFavorited: (favorited: boolean) => trackEvent('folder_favorited', { favorited }),
+	shareLinkCopied: () => trackEvent('share_link_copied'),
+	shareLinkDeleted: () => trackEvent('share_link_deleted'),
+	trashRestored: (type: string) => trackEvent('trash_restored', { type }),
+	trashEmptied: () => trackEvent('trash_emptied'),
+	searchPerformed: (resultsCount: number) =>
+		trackEvent('search_performed', { results: resultsCount }),
+	viewModeChanged: (mode: string) => trackEvent('view_mode_changed', { mode }),
+};
+
 /**
  * Mukke App Events
  */