ui(components): migrate remaining 27 skeleton files to Skeleton shimmer
Complete the migration of all inline `animate-pulse bg-muted` patterns
to the shared `<Skeleton>` component with premium shimmer animation.
Covers: UserProfilePage, SearchPage, CourseDetailView, ProductDetailView,
NotificationsPage, ChatMessages, SessionsPage, RegisterPage, AudioPlayer,
DataList, AccountSettings, Dialog, CourseLearningView, TwoFactorSetup,
ProjectsManager, GoLiveView, ConnectivityView, AIToolsView,
CloudSettingsView, EquipmentDetailView, NotificationMenu, PlaybackHeatmap,
ProjectDetailView, AvatarUpload, ShareLinkManager, OptimizedImage, BlurPlaceholder.
Co-authored-by: Cursor <cursoragent@cursor.com>
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