fix: set path variables when trying to run npm commands

[Snowblaze]

Description

When installing the plugin on MacOS, it fails to use npm. Providing the paths resolves the issue.

This PR fixes npm command execution failures on macOS by ensuring the PATH environment variable includes common npm installation locations. The fix modifies the RunNpmCommand method in Editor/Utils/McpUtils.cs to explicitly set PATH environment variables before executing npm commands.

Technical Details

The solution adds /usr/local/bin and /opt/homebrew/bin (common npm installation paths on macOS) to the PATH environment variable when running npm commands. This ensures that the system can locate npm executables even when they're installed in non-standard locations, which is common on macOS systems, especially those using Homebrew.

Changes Made

• Modified McpUtils.RunNpmCommand() method to set PATH environment variables
• Added logic to combine current PATH with common macOS npm installation directories
• The fix is applied before existing custom npm path logic, ensuring compatibility

Changes that Break Backward Compatibility

N/A

Documentation

N/A

Created with Palmier

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[CoderGamester]

This is a great improvement, thank you
I only request to put this code changes inside of the "// macOS / Linux" else block

[CoderGamester]

LGTM