Add button for AI delegate prompt editor, harmonize prompts, and fix initialization bug.

Summary

New AI delegate features need further integration into application.

Is this a new feature?

• Yes, this is a new feature
• No, this is a change to existing functionality

Description of new functionality

We need UI features to see prompt editor from new ai-delegate work in various places where the AI assistant is used. In particular, a button is required instead of typing AiDelegate.openPromptEditor() in console.

We need to harmonize new prompt editor prompts with current system prompts, particularly in feed generator where AI assistant is able to modify its own system prompt. Is the new prompot

Need to fix initialization bug where prompt editor can't be opened until system is initialized.

Fix prompt editor itself to allow users to opt-out of parameter input and enter a clean prompt.