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Implement DSFA optimization plan based on DSK Kurzpapier Nr. 5: - Section 0: ThresholdAnalysisSection (WP248, Art. 35 Abs. 3, KI-Trigger) - Section 5: StakeholderConsultationSection (Art. 35 Abs. 9) - Section 6: Art36Warning for authority consultation (Art. 36) - Section 7: ReviewScheduleSection (Art. 35 Abs. 11) - DSFASidebar with progress tracking for all 8 sections - Extended DSFASectionProgress for sections 0, 6, 7 Replaces tab navigation with sidebar layout (1/4 + 3/4 grid). Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>