FR/Suggestion: Support showToast for DCP notifications

[essinghigh]

At the moment, messages are queued into the chat as user messages which in my opinion looks/feels a little obtrusive.

I'm not 100% sure how this functions for things like Github Copilot premium requests, etc, but I'm assuming it probably uses burns a premium request as it's treated as a "user" message?
Being an idiot, missed noReply: true

Depending on whether you actually care about keeping a log of tokens that have been discarded / extracted (is this useful information to keep in the session chat?), it may be a good idea to use showToast instead to display a notification toast. I've had a quick play about and it is not too difficult to implement:

This could be supported as a config option in dcp.jsonc, something like notificationType: "chat" | "toast"
Let me know what you think.

[Tarquinen]

I like it! If you PR it, can you add it as a 4th option in the config under "pruneNotification"? noReply isn't actually significant here, if I remember right it just prevents the user message from starting the AI loop, what matters is the "ignored" field, which marks this message as one that won't be a part of the session context, meaning these user messages are effectively just UI.

I want to keep the current system, I think there will be users that preffer it, but I'm happy to offer yours as an option as well for those that want it.

[Tarquinen]

This is in latest now, thanks for the help!