gsxdsm 0039480334 fix(FUX-039): harden runtime-fallback agent-card viewport gating ...

Follow-up hardening on the RuntimeFallbackBadge viewport-gating work:

- AgentsView.tsx: registerAgentCardRef now returns a cached, stable callback per
  key (agentCardRefCallbacksRef) instead of a fresh closure each render. A fresh
  closure reads as unmount+remount to React; in environments without
  IntersectionObserver the mount path calls setVisibleAgentCardKeys -> re-render
  -> another fresh closure -> an infinite re-render loop (including jsdom). The
  cached entry is evicted on true unmount (el === null) so the Map cannot grow
  unbounded across created/deleted agents.
- ActiveAgentsPanel.tsx: document the viewport-gated badge polling with an FNXC
  comment (behavior unchanged).
- useRuntimeFallbackStatus.ts: guard __resetRuntimeFallbackToastDedupeStoreForTests
  to a no-op outside the test build (import.meta.env.MODE !== "test") so the
  test-only dedupe reset can never affect production code paths.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2026-07-08 15:24:01 -07:00

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