Regression: macOS Shortcuts "New Terminal" broken since 1.3.0

[XanderHess]

Issue Description

When using the "New Terminal" App Intent in Shortcuts on macOS, anything but a simple command will fail running.

There are two issues here, the first appears to be due to the change in commit 471098d:
If the Command input has been used at any point in the element's lifetime and has been cleared again, it still puts quotes around an empty string and tries to run ''; exit this fails with zsh: permission denied: in ZSH and bash: : command not found in Bash.

The other issue appears to be due to the change in 1ff0dd8:
The escaping of special characters is overzealous in this context and wil cause trying to run a command with parameters, for example git status, to fail because the space between the actual command and the parameter(s) will have been escaped.

Expected Behavior

• If the Command input in the "New Terminal" intent is empty, the user's login shell should be launched and run until exited manually.

• Specifying a command should allow for adding parameters to said command.

Actual Behavior

• Inputting text into the Command input and then clearing it again will cause ''; exit to be run, resulting in an error.

• Specifying a command with parameters, e.g. git status will cause an error because the space inbetween gets escaped and effectively running 'git\ status'; exit, resulting in an error.

Reproduction Steps

1. Open Shortcuts on macOS
2. Create new Shortcut
3. Add "New Terminal" from Apps > Ghostty
4. Input command with parameters into Command input, e.g. ls -al or input anything into Command input and clear the field again
5. Run Shortcut

Ghostty Logs

No response

Ghostty Version

Ghostty 1.3.1

Version
  - version: 1.3.1
  - channel: stable
Build Config
  - Zig version   : 0.15.2
  - build mode    : .ReleaseFast
  - app runtime   : .none
  - font engine   : .coretext
  - renderer      : renderer.generic.Renderer(renderer.Metal)
  - libxev        : kqueue

OS Version Information

macOS Sequoia 15.7.4

(Linux only) Display Server

None

(Linux only) Desktop Environment/Window Manager

No response

Minimal Ghostty Configuration

n/a

Additional Relevant Configuration

No response

I acknowledge that:

• I have reviewed the FAQ and confirm that my issue is NOT among them.
• I have searched the Ghostty repository (both open and closed Discussions and Issues) and confirm this is not a duplicate of an existing issue or discussion.
• I have checked the "Preview" tab on all text fields to ensure that everything looks right, and have wrapped all configuration and code in code blocks with a group of three backticks (```) on separate lines.