feat: show command to install a specific version

[luc122c]

All package manager commands shown in the UI accept @version suffixes. If the user is viewing a specific version, this PR will now make it so the clipboard text and the visual code snippet contain the version.

Manager	Install command	Docs
npm	npm install nuxt@3.0.0	https://docs.npmjs.com/cli/v10/commands/npm-install
pnpm	pnpm add nuxt@3.0.0	https://pnpm.io/cli/add
yarn	yarn add nuxt@3.0.0	https://yarnpkg.com/cli/add
bun	bun add nuxt@3.0.0	https://bun.sh/docs/cli/add
deno	deno add npm:nuxt@3.0.0	https://docs.deno.com/runtime/reference/cli/add/

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