consistency: replace custom buttons with Button component (partial)
- Replaced custom button implementations with Button component in 14 files
- Files updated: LiveStreamDetailView, DashboardPage, CommentItem, PostCard, SocialPage, SocialView, AdminUsersView, UserTableRow, ProjectsManager, CloudFileBrowser, FileManagerView, CreatorModal, ImageCropper, BulkUploadModal
- ~31 buttons replaced across high-priority files
- Used appropriate Button variants: ghost, outline, default, secondary, link
- Preserved visual appearance with className overrides where needed
- Action 9.2.1.2 in progress (partial completion)
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