feat(dashboard): set Speed Validation visualization to Histogram

[anant-shipit]

Fixes #107

Design Decisions Summary

Grouping & Panel Choice:
Grouped under "Vehicle Anomalies", the default timeseries made it difficult to visualize the distribution or isolate outliers reporting physically impossible velocities.

Visualization Rationale:
I chose a Histogram. A histogram buckets computed speeds into ranges, making it trivial to spot an anomalous right-tail (e.g., speeds > 100 km/h for a city bus). This is far more effective than a time series for isolating the fraction of vehicles reporting invalid speeds.

Go Metric Modifications:
No Go metric types were modified.

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