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Add SiloHistoryViewer widget that opens in an MDI subwindow when the user double-clicks the History node in the Silo tree. Displays revision cards newest-first with revision number, Catppuccin-themed lifecycle status badges, author, timestamp, and commit comment. Changes: - silo_viewers.py: SiloHistoryViewer with revision card layout, status badge QSS, scroll area, empty-history placeholder Closes #40