Tool call report - #2

Issue for this PR

Closes # anomalyco#11434

Notes

• This is a draft pr
• A more solid description of what should be added to the stats is needed. This is a throw everything in there and see what sticks pr.

Type of change

• Bug fix
• New feature
• Refactor / code improvements
• Documentation

What does this PR do?

Adds tool usage analytics to the session context tab to help users understand token consumption and tool failure patterns.

Changes:

• Tool call breakdown chart showing distribution across tools
• Tool failure visualization with success/failure rates
• Input and output token breakdowns by tool type
• Tool token summary table with per-call statistics (avg, median, p95, max) and pattern classification
• Enhanced raw message display with tool previews and token counts

How did you verify your code works?

Added unit tests covering:

• Empty inputs and edge cases
• Mixed tool states (pending/running/completed/error)
• Aggregation across multiple messages
• Pattern classification thresholds (spike_dominated, failed_cost_driver, consistently_expensive, repeated_small, etc.)

Screenshots / recordings

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR