fix: add wl-copy support for Wayland environments

[Poukk]

Summary

• Add Wayland clipboard support using wl-copy from wl-clipboard package
• Detect Wayland environment via WAYLAND_DISPLAY env variable
• Falls back to xclip/xsel if wl-copy is not available

Greptile Summary

Adds Wayland clipboard support to the CLI's clipboard utility by detecting the WAYLAND_DISPLAY environment variable and attempting wl-copy before falling back to xclip/xsel. This is a small, focused change that does not break existing clipboard behavior on macOS, Windows, WSL, or X11 Linux.

• Adds isWayland() helper that checks process.env.WAYLAND_DISPLAY
• Inserts wl-copy attempt in the Linux clipboard chain after WSL checks and before xclip/xsel fallback
• Follows existing code patterns and error handling conventions
• No plan .md files found in this PR
• No AGENTS.md violations detected

Confidence Score: 5/5

• This PR is safe to merge — it adds a new clipboard path without altering existing behavior.
• The change is minimal (adding a new clipboard tool attempt in the existing fallback chain), follows established patterns, does not modify any existing logic paths, and gracefully falls through to existing xclip/xsel handling if wl-copy is unavailable.
• No files require special attention.

Important Files Changed

Filename	Overview
apps/cli/src/tui/clipboard.ts	Adds Wayland clipboard support via wl-copy, with correct ordering (after WSL, before xclip/xsel fallback) and consistent error handling. No issues found.

_{Last reviewed commit: 4dcd5c7}

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Context used:

• Context from dashboard - AGENTS.md (source)