feat(web): add terminal toggle button to chat header

[antiisaint]

Closes #625

What Changed

Added a terminal toggle button to the chat header.

This uses the existing terminal toggle behavior in the chat header.

Why

The terminal was mainly discoverable through keyboard shortcuts. This adds a visible control for opening and closing it.

UI Changes

Before:

• No terminal toggle button in the chat header

After:

• Added a terminal toggle button to the chat header

Video:

0309.mov

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Add terminal toggle button to chat header

• Adds a TerminalSquareIcon toggle button to ChatHeader that opens and closes the terminal drawer.
• The button is disabled when no active project is set, and its tooltip shows the configured keyboard shortcut when available.
• ChatView computes the shortcut label via shortcutLabelForCommand and passes terminal state and the toggle handler down to ChatHeader.

^{Macroscope summarized af0caea.}

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[antiisaint]

cc @juliusmarminge, looks like there's some interest in the linked issue, so figured it was worth bringing back up.