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Add runtime type validation after all JSON.parse calls in the web app to prevent runtime crashes from corrupted or tampered storage data. Creates a shared safeJsonParse utility with type guard functions for each data shape (Message[], ChatOverlayState, LayoutConfigRecord). All four affected callsites now validate parsed data and fall back to safe defaults on mismatch. Files changed: - apps/web/src/lib/utils/safe-json.ts (new utility) - apps/web/src/lib/utils/safe-json.test.ts (25 tests) - apps/web/src/hooks/useChat.ts (deserializeMessages) - apps/web/src/hooks/useChat.test.ts (3 new corruption tests) - apps/web/src/hooks/useChatOverlay.ts (loadState) - apps/web/src/hooks/useChatOverlay.test.ts (3 new corruption tests) - apps/web/src/components/chat/ConversationSidebar.tsx (ideaToConversation) - apps/web/src/lib/hooks/useLayout.ts (layout loading) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>