feat(dashboard): set API-GTFS-RT Consistency visualization to State Timeline

[anant-shipit]

Fixes #103

Design Decisions Summary

Grouping & Panel Choice:
Grouped under "Realtime Feed Health", the panel plotted binary match values on a timeseries, which isn't optimal for showing strict state changes over time.

Visualization Rationale:
I chose a State Timeline. Consistency is binary: the counts either match or they do not. A state timeline panel turns each evaluation period into a vivid block of green (match) or red (mismatch), making it trivial to trace exactly when an inconsistency started and ended.

Go Metric Modifications:
No Go metric types were modified.

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