- Updated imports and references from ChatStream to BotChatSession across multiple files.
- Adjusted method signatures and internal logic to accommodate the new session management.
- Ensured compatibility with existing functionality while improving code clarity and maintainability.

…and VoiceSection components

- Deleted RuleEditor.tsx, RuleList.tsx, RulePreview.tsx, TimeRangePicker.tsx, and VoiceSection.tsx as part of a cleanup.
- Updated index.ts to remove imports related to deleted components.
- Modified types.ts and model.tsx to accommodate changes in task configuration structure.
- Introduced new types for TargetItem and LearningItem to enhance type safety.
- Refactored ModelTaskConfig to be dynamic based on backend schema.
- Updated ModelProviderConfigPage to unwrap backend config response for better handling.

…d clarity and consistency

- Updated Codec class to use abstract methods for encoding and decoding envelopes.
- Changed Envelope class to use Dict and Optional for payload and error fields.
- Refined error handling in RPCError class with Optional type hints for details.
- Enhanced manifest validation logic with type hints for better type safety.
- Improved plugin loading mechanism with consistent type annotations.
- Updated RPCClient to utilize Optional for codec and connection attributes.
- Refactored transport classes to use Optional for server attributes and socket paths.