Dashboard Member Drill-down per-member metrics and blockers

[csharpfritz]

Description

Add clickable member cards in the dashboard that expand to show per-member metrics: completed tasks over time, current blockers, skill usage frequency, and recent activity timeline.

Approach

• Add click handler to member cards in dashboard webview
• Drill-down panel shows: tasks completed (chart), active blockers, skills used, recent log entries
• Reuse existing SquadDataProvider methods with per-member filtering
• May require new service methods for skill frequency analysis

Acceptance Criteria

• Click on a member card opens a drill-down panel
• Shows task completion metrics over time
• Shows current blockers or waiting items
• Shows skill usage frequency
• Recent activity timeline from orchestration logs

[github-actions]

📋 Assigned to Rusty (Extension Dev)

Issue: #76 — Dashboard Member Drill-down per-member metrics and blockers

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Rusty, work on issue #76