<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
* **New Features**
* Centralized sync/status messages for cloud document sync and explicit
user-facing error types.
* Frontend helpers to detect and display tool errors with friendly
names.
* **Bug Fixes**
* Consistent, actionable error reporting for document and attachment
reads instead of silent failures.
* Search and semantic tools now validate workspace sync and permissions
and return clear responses.
* **Tests**
* Added comprehensive tests covering document/blob reads, search tools,
and sync/error paths.
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