Silent clipboard failure on Linux when xclip is missing

Bug Report: Silent clipboard failure on Linux when xclip is missing

Summary

On Linux, Pinokio's clipboard feature (pterm clipboard copy/paste) fails silently when xclip is not installed. The control-plane endpoint returns an error that is never surfaced to the user, so copy-paste appears broken with no explanation.

Environment

• OS: Linux Mint 22.3 (Ubuntu Noble base)
• Pinokio: /opt/Pinokio (Electron app)
• pterm CLI

Steps to Reproduce

1. Fresh Linux system without xclip.
2. Run pterm clipboard copy "hello world" -> exits 0, appears successful.
3. Run pterm clipboard paste -> empty output.

Actual Behavior

POST to http://127.0.0.1:42000/clipboard returns:

{"error":"Error: spawn xclip ENOENT ..."}

The error is swallowed; the CLI prints nothing and exits 0.

Expected Behavior

• Auto-install or detect xclip on Linux, or
• At minimum, surface the error to the user ("xclip is required for clipboard support on Linux: sudo apt-get install xclip").

Fix That Worked

sudo apt-get install -y xclip -- after install, clipboard round-trip works immediately without restarting Pinokio.