feat(setup): copy wizard code blocks with c

[ffantl-ld]

Requirements

• I have added test coverage for new or changed functionality
• I have followed the repository's pull request submission guidelines
• I have validated my changes against all supported platform versions

Related issues

REL-15243, under the CLI Onboarding Wizard A/B epic (REL-15183).

Stacked on #753, which introduces cmd/setup.

Describe the solution you've provided

• Add a c keybinding at the wizard's final screen that copies the raw init snippet — or the install command, when there is no snippet — to the clipboard
• Copy through the operating system's clipboard first, falling back to OSC 52 only when that fails
• Label the action next to the code block and confirm it once copied, wording the two paths apart because only the OS clipboard can be confirmed
• Inject both the OS clipboard function and the terminal writer on wizardModel so tests drive either path without a real clipboard or terminal

The code block is drawn with a left gutter bar, so selecting it with the mouse copies the gutter characters and the padding lipgloss squares the block off with, and pasting that fails on every line. The wizard also runs in the alternate screen, so the snippet is not in scrollback once it exits — the copy has to happen while the TUI is live, which is exactly when the gutter is in the way.

Describe alternatives you've considered

• OSC 52 alone. Rejected: terminals are not required to implement it, Apple Terminal does not, and support cannot be queried — so the confirmation would claim a copy that never happened, on the macOS default terminal. It stays as the fallback because it is what works over SSH, where the OS clipboard belongs to the wrong machine.
• Removing the gutter bar so mouse selection copies cleanly. Rejected: it gives up the visual distinction between copy-me code and prose, and still copies the leading padding.
• Printing the snippet unstyled after the wizard exits, so it lands in scrollback. Complementary rather than alternative — worth doing, but a separate change.

Additional context

github.com/atotto/clipboard moves from an indirect to a direct dependency, and github.com/charmbracelet/x/ansi likewise for SetSystemClipboard. Both were already in the module graph; no new module is added.

Residual gap: a Linux host with no clipboard tool installed (xclip, xsel, wl-clipboard) and a terminal that ignores OSC 52 gets no copy. That combination reports "Asked your terminal to copy…" rather than claiming success.

Testing approaches

• Seven tests in cmd/setup/copy_test.go: the copied payload is byte-for-byte the raw snippet (asserted against the rendered view, which does contain the gutter bar the copy does not), snippet preferred over install command when both show, fallback to the command, no copy on screens with nothing to copy, hint switches to confirmation, c still reaches the list filter while filtering, and a failing OS clipboard falls back to a well-formed OSC 52 sequence without claiming the copy completed.
• go build ./..., go vet, gofmt, and go test ./... clean; 52 subtests in cmd/setup; golangci-lint passed via pre-commit.
• Not yet exercised against a real terminal or clipboard — worth a manual check of both paths (locally, and over SSH) before merge.

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Note

Low Risk
TUI-only UX in the setup wizard with no auth or API changes; clipboard/OSC 52 behavior is well covered by unit tests.

Overview
Adds c on the setup wizard’s stepDone screens so users can copy raw init snippets or failed install commands without the TUI gutter/padding.

Copy tries the OS clipboard (atotto/clipboard) locally, skips it when SSH env vars indicate a remote session, and falls back to OSC 52 via ansi.SetSystemClipboard. UI hints distinguish confirmed clipboard writes from “asked your terminal” requests. c is ignored while list filtering is active.

wizardModel gains injectable nativeCopy and clipboard writers plus copyState for tests; copy_test.go covers snippet vs command priority, OSC 52 fallback, and remote-session behavior. go.mod promotes clipboard and charmbracelet/x/ansi to direct requires.

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