[FEATURE] Add Analytics Dashboard to Gallery View

[davidamacey]

Is your feature request related to a problem? Please describe.
Users currently lack a consolidated view of analytics for their media collections, making it difficult to gain insights about speakers, content, and validation status across multiple media files.

Describe the solution you'd like

• Add an analytics panel to the gallery view that updates based on current filters
• Include the following key metrics:
  • Speaker statistics (who talked the most, duration per speaker)
  • Media statistics (total duration, number of files)
  • Validation status (number of items needing review/validation)
  • Comment statistics (number of comments, distribution across media)
• Make the dashboard interactive:
  • Click on metrics to drill down into specific media
  • Filter analytics by collection, date range, or other relevant parameters
  • Export analytics as CSV/PDF

Phase 1 - Core Analytics

• Speaker participation metrics
• Media duration and count
• Basic validation status tracking

Future Enhancements

• LLM-generated summaries
• Topic modeling and trends
• Sentiment analysis
• Custom report generation

Use case

• A user wants to analyze speaker participation across a collection of meeting recordings
• A researcher needs to identify which media files require validation
• A manager wants to track discussion topics and participation over time

Technical considerations

• Use a responsive design that works on different screen sizes
• Implement efficient data aggregation to handle large collections
• Consider using a visualization library (e.g., Chart.js, D3.js) for interactive charts
• Cache analytics data for better performance
• Support both light and dark themes

Additional context

• The analytics should respect the user's current filters
• Consider adding tooltips and help text for each metric
• Include loading states for when data is being processed
• Ensure the dashboard is accessible (WCAG 2.1 AA compliance)

Acceptance Criteria

• Analytics panel updates when filters change
• Core metrics are displayed clearly
• Interactive elements provide meaningful drill-down
• Performance remains acceptable with large datasets
• Mobile-responsive design
• Documentation for new features