Desktop: Skill feature not yet connected to Desktop app

[wangtsiao]

Task

Skills functionality has not been integrated into the Desktop app.

What's needed

Skills are available in the TUI/CLI (/skill) but the Desktop app has no configuration or invocation interface for them.

Requirements

• Desktop app needs configuration for skill directories/packages
• Skill invocation UI or command integration
• Skill output should render correctly in the Desktop chat transcript

Related components

• crates/core/src/skills.rs
• crates/protocol/src/skill.rs
• Desktop app settings/packaging