[FEATURE] Make skills/slash commands discoverable via UI dropdown

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

As a non-developer user, I frequently forget what skills/slash commands are available in Claude Code. The only way to discover them is to type / and remember the command names. There's no persistent, visual indicator of available skills during a session. The preview panel has great discoverability because it's always visible near the top — skills should follow the same pattern.

Proposed Solution

Add a dropdown menu or button near the top of the session header (similar to how the preview panel is accessible) that lists all available skills/slash commands. This would let users browse and trigger skills without needing to memorize command names. Clicking a skill from the dropdown would invoke it.

Alternative Solutions

Currently I have to remember to type / and recall command names, or ask Claude what skills are available. This is not intuitive for non-technical users.

Priority

Medium - Would be very helpful

Feature Category

Other

Use Case Example

I'm in the middle of a coding session and want to do a code review, but I don't remember the exact slash command. Instead of interrupting my workflow to ask "what skills do you have?", I'd click a dropdown at the top of the session, see /code-review, /commit, /deploy, etc., and click the one I need.

Additional Context

_No response_