macOS: expand tilde in file paths before opening

[AlexFeijoo44]

Summary

Cmd-clicking a file path containing ~ (e.g. ~/Documents/file.txt) fails to open the file on macOS because URL(filePath:) treats ~ as a literal directory name rather than the user's home directory.

This uses NSString.expandingTildeInPath to resolve ~ before constructing the file URL.

Root Cause

In openURL(), when the URL string has no scheme it falls through to:

url = URL(filePath: action.url)

Swift's URL(filePath:) does not perform tilde expansion. A path like ~/Documents/file.txt produces a URL pointing to a non-existent file, and NSWorkspace.open silently fails.

Fix

let expandedPath = NSString(string: action.url).expandingTildeInPath
url = URL(filePath: expandedPath)

Reproduction

1. Have a terminal application (e.g. Claude Code) that outputs file paths with ~ prefixes
2. Cmd-click the path in Ghostty on macOS
3. The file does not open (fails silently)

With this fix, the path resolves correctly and opens in the default editor.

[ghostty-vouch]

Hi @AlexFeijoo44, thanks for your interest in contributing!

This project requires that pull request authors are vouched, and you are not in the list of vouched users.

This PR will be closed automatically. See https://github.com/ghostty-org/ghostty/blob/main/CONTRIBUTING.md for more details.

[mitchellh]

!vouch

[mitchellh]

Thanks, this simple change looks right to me.