Add Report Card to ClaudeBar

Add new report cards that analyze local data sources, compute metrics with comparison deltas, and display them in the existing card UI style using TDD.

When to Use

This skill covers adding report-style features — cards that:

• Read and parse local data files (JSONL, JSON, CSV, etc.)
• Aggregate metrics (cost, tokens, time, counts)
• Compare periods (today vs yesterday, this week vs last week)
• Display results in glassmorphism cards matching the existing UI

Architecture Pattern

Every report feature follows this data flow: