Update store documentation

**Problem**
When working with components, the error messages could be more descriptive.

**Suggestion**
Improve error handling and add detailed error messages.

**Context**
This would help with debugging and maintenance.

No files, tests, or entry points are named. Start by locating the component error-handling paths and reviewing the current messages; done means the relevant failures produce detailed, useful error messages and existing behavior remains covered by tests.

Written by the indexing model from the issue text.