Track per-actor message type histogram in ActorSlot (bounded to 32
distinct types). Extend ActorSnapshot and ActorInfo to carry sorted
type counts through the stats pipeline.
Web actor detail page shows horizontal bar chart with per-type colors,
counts, and percentages. TUI actor detail view renders text-based bar
table with 6-color rotation. Data flows through existing SSE stats
events with no additional endpoints needed.
Authored by Claude, lovingly guided by Zachery Aaron Shores-Chmielewski
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