Feat: Enhance Neural Buffer UX

[Angelchev]

There are some additional features we can add that would make the neural buffer easier to use such as:

• Show the currently active model for the buffer
• Change the active model just for the buffer
• Change settings for the model just for the buffer
• Surface various details about the Neural buffer:
  • Live token counter for the current model e.g. 100/4096 through virtual text or floating window
  • Show current temperature, Top P, Frequency Penalty, Presence penalty, etc.
• Add markdown syntax highlighting for buffer