Show command menu when pressing slash (/) in command input

[taylorarndt]

Feature Request

When viewing the command input, pressing the slash (/) should open a menu. This menu could display available commands or actions, similar to menus in Claude, Copilot, or code editors. This should improve user efficiency and discoverability of features.

Desired Behavior

• When the user presses / in the command input, a contextual menu appears.
• The menu lists available commands (for example: "code", "claude", "help", etc.), and lets the user select from them.
• Should be responsive and accessible.

Assignee
Assign to @mikedoise for implementation.