[BUG] TUI - Skill loading indicator appears twice in terminal UI

[flora131]

Description

When a skill is loaded via a slash command, the terminal UI displays the skill loading indicator (e.g., skill (prompt-engineer)) twice. It's unclear whether the skill is actually being loaded/executed twice or if this is purely a UI rendering issue, but the duplicate output is visible in the terminal.

Steps to Reproduce

1. Start a session in Atomic.
2. Type a prompt that invokes a skill, for example:

   /prompt-engineer
   

3. Enter the following prompt:

   Optimize this prompt. Create a game for me and Rust that is six different snakes, with 10 levels, and you win with whoever's snake is fastest. It's a race snake game.
   

4. Press Enter.

Expected Behavior

The terminal UI should display the skill loading indicator once:

skill (prompt-engineer)

Actual Behavior

The terminal UI displays the skill loading indicator twice:

skill (prompt-engineer)
skill (prompt-engineer)

Open Questions

• Is the skill actually being loaded/invoked twice (functional bug), or is this only a duplicate rendering issue in the TUI?
• Does this affect all skills or only specific ones?

Related

This may be related to the recent TUI rendering fixes in #201 (fix(ui): improve sub-agent tree rendering, skill loading, and lifecycle management).

[flora131]