Add Statistics page with aggregated data

[codebymini]

Add Advanced Statistics View

Summary

This PR introduces a comprehensive statistics view that provides detailed glucose and treatment analytics across multiple time periods (1, 14, and 30 days).

Features Added

📊 Core Statistics

• Aggregated Stats View: Central dashboard displaying key metrics
  • GMI (Glucose Management Indicator) with toggle to eHbA1c
  • Average glucose
  • Standard deviation with toggle to CV (Coefficient of Variation)
  • Total daily dose (insulin)
  • Average bolus and carbs
  • Basal comparison (programmed vs. actual delivered)

📈 Ambulatory Glucose Profile (AGP)

• Visualizes glucose percentiles (5th, 25th, 50th/median, 75th, 95th) across a 24-hour period
• Helps identify patterns and glucose variability throughout the day
• Interactive graph with hour-by-hour breakdown

⏱️ Time in Range (TIR)

• Period-based analysis (Night, Morning, Day, Evening, Average)
• Categorizes glucose levels:
  • Very Low (<54 mg/dL)
  • Low (54-70 mg/dL)
  • In Range (70-180 mg/dL or 70-140 mg/dL in tight mode)
  • High (180-250 mg/dL)
  • Very High (>250 mg/dL)
• Toggle between standard TIR and TITR (Time in Tight Range)
• Stacked bar chart visualization

🎯 Glucose Risk Index (GRI)

• Calculates and visualizes glucose variability risk
• Risk grid showing classification zones
• Comprehensive risk assessment metrics

Technical Implementation

New Components

• AggregatedStatsView.swift - Main statistics container
• AGPCalculator.swift, AGPView.swift, AGPViewModel.swift - AGP implementation
• TIRCalculator.swift, TIRView.swift, TIRViewModel.swift - TIR implementation
• GRICalculator.swift, GRIView.swift, GRIViewModel.swift - GRI implementation
• SimpleStatsViewModel.swift - Basic stats calculations
• StatsDataService.swift - Data management service
• StatsDataFetcher.swift - Historical data fetching (up to 30 days)
• ChartContainerView.swift - Chart wrapper utilities

Data Management

• Added separate stats data storage arrays in MainViewController:
  • statsBGData - Blood glucose readings
  • statsBolusData - Bolus entries
  • statsSMBData - SMB entries
  • statsCarbData - Carb entries
  • statsBasalData - Basal rate data
• Supports up to 30 days of historical data
• Automatic data fetching with progress tracking

User Preferences

Added new storage preferences:

• showGMI - Toggle between GMI and eHbA1c display
• showStdDev - Toggle between Standard Deviation and CV
• showTITR - Toggle between TIR (180 mg/dL) and TITR (140 mg/dL)

UI Integration

• Added "Statistics" menu item to More Menu
• Accessible from Settings menu
• Full-screen modal presentation with navigation
• Supports dark mode
• Period selector (1 day, 14 days, 30 days)
• Pull-to-refresh functionality

Bug Fixes

• Fixed string formatting in MainViewController+updateStats.swift (removed duplicate % symbols in format strings)

Changes to Existing Files

• SettingsMenuView.swift - Added wrapper for accessing statistics
• MoreMenuViewController.swift - Added statistics menu entry
• MainViewController.swift - Added stats data storage arrays
• Storage.swift - Added statistics display preferences
• project.pbxproj - Added Stats folder and file references