fix: package manager copy buttons

[MohamedH1998]

Summary

Clicking a package-manager copy button could make every other copy icon on the page vanish. This fixes it by toggling icons instead of replacing the button's contents.

Why

astro-icon renders the first ph:copy on a page as a shared … and every other instance as . That definition happens to live inside the first copy button.
The click handler swapped the icon with btn.replaceChildren(...). So clicking the button that hosts the definition deleted the , orphaning all 12+ references — every other copy icon disappeared, and didn't come back (the 1.5s "restore" was itself a pointing at the now-missing symbol).
Repro: https://developers.cloudflare.com/workers/framework-guides/automatic-configuration/#deploy-with-automatic-configuration — click one copy button, watch the others go blank.

The fix

• PackageManagers.astro — each button now renders both icons (ph:copy + a hidden ph:check); dropped the two icon blocks.
• package-managers.client.ts — the handler toggles the hidden class on the two icons instead of replaceChildren. Nodes are never removed, so the shared always stays in the DOM. Removed the now-unused cloneIcon/template plumbing.
  Doesn't rely on astro-icon's dedup internals: even a display:none is a valid target, and nothing gets detach

Screenshots (optional)

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[cloudflare-docs-bot]

Review

✅ No issues found in commit 028f050.

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
*.astro	@cloudflare/content-engineering, @kodster28
*.ts	@cloudflare/content-engineering, @kodster28

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