Allow custom text styling in skill/command output

Feature Request

Custom slash commands (skills) currently output standard markdown-rendered text. It would be great if skill output could support the same dimmed/styled text rendering used by the built-in ? help menu.

Use case: I created a /? skill that displays keyboard shortcut reference for the input field. It works well, but the output renders in regular conversation text style, while the built-in ? uses a more subtle, dimmed style that feels appropriate for quick-reference help. Being able to match that styling would make custom help commands feel more native.

Possible approach: Support ANSI-style hints or a frontmatter option in command .md files to control output styling (e.g., style: help or style: dimmed).

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