chore: remove clipboard package, do it ourselves. mac only

[notnmeyer]

turns out the clipboard package i was using required cgo. local builds on my mac worked fine, but ci builds on Ubuntu were broken. i quickly despised having to sort out the build crap for something so simple. this swaps the package for a home-rolled exec to pbcopy.

only supports mac for now, but there were wayland issues on linux already anyway.

[Copilot]

Pull Request Overview

This PR replaces the external clipboard package (which required cgo) with a mac-only pbcopy wrapper and updates build tasks accordingly.

• Adds a dependency on the deps task before building.
• Removes golang.design/x/clipboard (and related indirect packages) from go.mod.
• Implements a custom pbcopy command in cmd/copy.go for macOS only.

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 2 comments.

File	Description
tasks.toml	Adds deps = [["deps"]] to ensure dependency tasks run
go.mod	Removes the clipboard package and other unused modules
cmd/copy.go	Removes clipboard import and adds pbcopy exec wrapper

Comments suppressed due to low confidence (2)

cmd/copy.go:47

• [nitpick] Using copy as a function name shadows the Go built-in copy function. Consider renaming it to something more descriptive like copyToClipboard.

func copy(content []byte) error {

cmd/copy.go:58

• The new pbcopy implementation isn't covered by automated tests. Consider adding a test that mocks exec.Command, or abstracting the exec call to verify behavior without spawning a real process.

func pbcopy(content []byte) error {