1045 Control Center Bug Fixes 9d06f875

# Control Center Bug Fixes - Summary

## Issues Fixed

### 1. ✅ **Duplicate "Documents" in Legend**
- **Problem**: Chart legend showed "Documents" twice (green and red entries)
- **Root Cause**: Template had 4 legend items but only 3 datasets in the chart
- **Fix**: Removed duplicate red "Documents" legend item and updated column layout from `col-3` to `col-4` for proper spacing

### 2. ✅ **JavaScript Error Causing Spinning Icon**
- **Problem**: `Cannot read properties of undefined (reading 'date')` error in tooltip callback
- **Root Cause**: Tooltip callback was trying to access `activityData[dataIndex].date` but `activityData` is an object with `{chats: {}, documents: {}, logins: {}}` structure, not an array
- **Fix**: Updated tooltip callback to use correct data structure:
  ```javascript
  // Before (incorrect)
  const date = new Date(activityData[dataIndex].date);
  
  // After (correct)  
  const dateStr = sortedDates[dataIndex];
  const date = new Date(dateStr);
  ```

### 3. ✅ **Loading Spinner Never Disappearing**
- **Problem**: Spinning icon stayed visible even after chart loaded
- **Root Cause**: JavaScript error prevented proper completion of chart rendering
- **Fix**: 
  - Fixed the tooltip callback error
  - Added proper error handling with try-catch around chart creation
  - Enhanced loading spinner hiding with debug logging
  - Added fallback error handling to ensure spinner is always hidden

## Files Modified

1. **templates/control_center.html**:
   - Removed duplicate "Documents" legend item
   - Updated column layout from `col-3` to `col-4`

2. **static/js/control-center.js**:
   - Fixed tooltip callback to use correct data structure
   - Added try-catch error handling around chart creation
   - Enhanced loading spinner management
   - Added debug logging for troubleshooting

## Result

✅ **Chart Legend**: Now shows exactly 3 items (Chats, Documents, Logins) with proper spacing
✅ **JavaScript Error**: Fixed tooltip callback error that was breaking chart rendering  
✅ **Loading Spinner**: Now properly disappears after chart loads or shows error message
✅ **Error Handling**: Added robust error handling to prevent future similar issues
✅ **Data Sources**: Still correctly using activity_logs for logins, conversations.last_updated for chats, documents.upload_date for documents

The Control Center activity trends chart should now display correctly without duplicate legend entries and the loading spinner will properly disappear once the chart is rendered!