Events from previous WebSocket/gRPC connections and HTTP responses were
persisting in the store and displaying in new connections. Added filter
parameter to mergeModelsInStore that clears old events when switching
connections, plus render-time filtering as a safety net.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Events stream in via model_write listener while also being fetched
from the database. If the DB fetch completed before all events were
persisted, replaceModelsInStore would wipe out events that came in
via model_write.
Added mergeModelsInStore that adds fetched events without removing
existing ones. Applied to HTTP, gRPC, and WebSocket event hooks.
