Debug Search and Stock Behavior in a Library Application

You inherit a library web application with book search, filtering, and stock management. Some pages show incorrect state and some searches return incomplete results. Explain how you would diagnose and fix the problems while using an AI assistant only to explain code or narrow the search area.

Constraints & Assumptions

The report describes an existing application but supplies no repository or exact failing example. Do not invent a specific root cause. The permitted AI workflow helps understand code; it does not directly supply or apply the final fix.

Clarifying Questions

What exact query, filter, and inventory change reproduces each symptom? What result is expected? Is the discrepancy visible in the backend response, the browser state, or both?