#185 fix(desktop): use full PATH for open in app in production builds

Summary

• Fixed "open in VSCode/Cursor" not working in production builds
• When Electron apps are launched from Finder/Dock, they don't inherit the user's shell PATH, causing CLI commands like code and cursor to not be found
• Now uses getSupersetPath() which includes the user's full PATH (same approach as terminal-manager)
• Improved error messages to be more actionable

Test plan

• Build production app
• Launch from Finder/Dock (not terminal)
• Try "Open in Cursor" / "Open in VSCode" from workspace header
• Verify it opens correctly

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes

  • Clearer, more descriptive error messages when external processes fail to start or exit with errors.
  • Improved editor-opening behavior: tries app-specific URL schemes first, then falls back to the system default when needed.

• Chores

  • More reliable execution of external utilities by sourcing and caching the user’s shell PATH, improving binary discovery in production builds.

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