Frontend State Management Plan

Help me decide how to manage state for {{feature}} in {{framework}}. Distinguish the kinds of state (local UI, shared app, server cache, URL, form) and where each belongs, recommend the right tool or pattern for each rather than putting everything in one global store, how to handle server state and caching, and how to keep it simple and avoid over-engineering. Note the common mistake of reaching for a heavy global store for state that should be local, and how to keep state predictable and easy to debug.