Add `cancelStream` method to allow aborting active requests. Store the current `AbortController` on the client instance
and reset it when the stream completes or is cancelled. Update `ChatView` to call `cancelStream` on close.
Add comprehensive tests for stream cancellation scenarios, including aborting active requests, handling cancellation
when no stream is active, clearing the controller after normal completion, and allowing new streams after cancellation.
Update error handling and improve streaming capabilities in the Ollama client and related components. Key changes
include:
- Simplify error types and improve error handling
- Refactor streaming logic to use async generators
- Update tool execution and vault indexing
- Improve utility functions and types
- Update test files to reflect changes
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