Add Daily Mirror interactive dashboard with charts and pivot tables
- Created comprehensive dashboard with Chart.js visualizations - Added API endpoint /api/dashboard_data for aggregated data - Implemented weekly tracking for orders, production, and deliveries - Added interactive pivot table for customer × week analysis - Fixed collation issues in database joins - Includes 4 summary cards with key metrics - Charts display orders, production finished, and deliveries by week - Click-to-expand data tables for detailed view - Time range filter (4-52 weeks) - Data sources: scanfg_orders (finished), dm_orders, dm_deliveries
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