Party Coalition Analysis Matrix with Voting Heatmaps (Vaadin 8)

[pethers]

🎯 Objective

Create Vaadin 8 coalition analysis interface with voting pattern heatmaps and alignment matrices

📋 Background

The platform has view_riksdagen_coalition_alignment_matrix tracking party voting alignment, but no UI visualization. Need interactive heatmap showing coalition patterns and voting agreement rates.

📊 Current State (Measured Metrics)

• Coalition Views: 2 (alignment matrix, party coalation against annual summary)
• Voting Pattern Data: 20 vote summary views across parties
• Current UI: Basic party comparison tables
• Heatmap Visualization: None - critical for coalition analysis

✅ Acceptance Criteria

• Vaadin 8 heatmap component visualizing party-to-party voting alignment
• Color-coded cells showing agreement rates (0-100%)
• Interactive tooltips with detailed voting statistics
• Temporal filtering (select date range for analysis)
• Coalition scenario analysis tool (simulate different alliances)

📚 Related Documentation

• view_riksdagen_coalition_alignment_matrix
• view_riksdagen_party_coalation_against_annual_summary