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Greptile Summary

Adds an optional reasoning_content field to the Message interface for assistant messages, enabling support for reasoning-capable models like OpenAI's o1/o3 series.

• Added reasoning_content?: string to Message interface
• Implemented toggle button ('+ Reasoning' / '− Reasoning') for assistant role messages
• Auto-displays reasoning field when existing data contains reasoning_content
• Reasoning content field has full feature parity with main content field (variable references, env vars, dropdowns, auto-resize)
• Toggle state preserved in component state, data persisted when field is hidden
• Clean implementation following existing patterns for message content handling

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The implementation follows established patterns, adds an optional field without breaking changes, includes proper state management, auto-initialization logic, and full feature parity with existing content fields. No logic errors, security issues, or architectural concerns identified.
• No files require special attention

Important Files Changed

Sequence Diagram

sequenceDiagram
    participant User
    participant MessagesInput
    participant State
    participant Message

    User->>MessagesInput: Click "+ Reasoning" button
    MessagesInput->>State: toggleReasoningContent(index)
    State->>State: Update showReasoningContent[index] = true
    MessagesInput->>MessagesInput: Re-render with reasoning field visible
    
    User->>MessagesInput: Enter reasoning content
    MessagesInput->>Message: updateMessageReasoningContent(index, content)
    Message->>Message: Update message.reasoning_content
    Message->>State: setMessages(updatedMessages)
    
    User->>MessagesInput: Click "− Reasoning" button
    MessagesInput->>State: toggleReasoningContent(index)
    State->>State: Update showReasoningContent[index] = false
    Note over State,Message: reasoning_content data preserved
    MessagesInput->>MessagesInput: Re-render with reasoning field hidden

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