Integrate the 'save message' button

[dustinbyrne]

Overview

This specification outlines the implementation of the save-message event handler. The save-message event is triggered from the frontend Vue application and contains content, messageId, and threadId. The handler will open a new document containing the provided content and metadata, allowing the user to save the document.

This logic is already implemented in the Visual Studio Code extension and can be found here for reference.

Message handling:
https://github.com/getappmap/vscode-appland/blob/076746891e254ca46a592658641918253d0c81ed/src/webviews/chatSearchWebview.ts#L322-L338

Message forwarding from frontend to backend extension:
https://github.com/getappmap/vscode-appland/blob/076746891e254ca46a592658641918253d0c81ed/web/src/chatSearchView.js#L139-L141

Requirements

1. Event Handling:

   • The event save-message will be forwarded from the frontend.
   • The event contains the following data:
     • content: The main content to be displayed in the document.
     • messageId: A unique identifier for the message.
     • threadId: A unique identifier for the thread.

2. Document Creation:

   • A new document should be created with the provided content.
   • Metadata should be appended to the content footer in the form of markdown comments.

3. Metadata Format:

   • The metadata should be formatted as follows:

     [//]: # (This content was generated by AppMap Navie.)
     [//]: # (messageId: <messageId>)
     [//]: # (threadId: <threadId>)
     

4. Example:

   • Given the content Hello world, thread id example-thread-id, and message id example-message-id, the document should contain:

     Hello world
     
     [//]: # (This content was generated by AppMap Navie.)
     [//]: # (messageId: example-message-id)
     [//]: # (threadId: example-thread-id)