marcopanandClaude Fable 5
2f68b0d109
A render error in one viewer or gate widget unmounted the whole React root (white screen). Add a reusable ErrorBoundary (class component, no new dep) with resetKeys + an on-brand fallback, and wire it at two surfaces: - WidgetHost: isolates the gate widget (reset on descriptor id) so a malformed gate payload no longer blanks the conversation - SessionDocumentsPanel: wraps each document (reset on doc key/content) so one crashing viewer degrades only its section; siblings and the panel survive The observed crash: a schema-linking doc that parses but lacks `candidates` makes SchemaLinkingViewer throw. Verified live via Playwright against the mock backend. TDD throughout; tsc clean, 123/123 vitest (+8 new tests). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>