Docs: Clarify Storybook Initializer Packages

[miachillgood]

Summary

• Clarify that the Storybook initializer updates package.json with the storybook package, the project framework package, selected addons, and run/build scripts.
• Note that typical projects do not need to manually add @storybook/cli.

Fixes #20030.

Validation

• git diff --check

Manual testing

Documentation-only change. I reviewed the rendered MDX source and confirmed the new callout appears in the install flow after the initializer change list.

[github-actions]

	Fails
🚫	PR is not labeled with one of: ["ci:normal","ci:merged","ci:daily","ci:docs"]

Generated by 🚫 dangerJS against 3eed23e

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: a3e1f462-db2f-4269-b22f-6f8be5158124

📥 Commits

Reviewing files that changed from the base of the PR and between c4f53de and 3eed23e.

📒 Files selected for processing (1)

• docs/get-started/install.mdx

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📝 Walkthrough

Walkthrough

Added an informational callout to the install documentation explaining what the Storybook initializer does: updating package.json with the storybook package, framework-specific package, selected addons, and run/build scripts, while noting that @storybook/cli is typically not manually added.

Changes

Installer Documentation Update

Layer / File(s)	Summary
Initializer behavior callout docs/get-started/install.mdx	Info callout added describing how the Storybook initializer modifies package.json by adding the storybook package, framework package (e.g., @storybook/react-vite, @storybook/nextjs), selected addons, and run/build scripts, while clarifying that @storybook/cli is typically not manually installed.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• storybookjs/storybook#34828: Updates the same install documentation to use npm create storybook@latest command in the initializer prompt.
• storybookjs/storybook#34648: Adds copy-prompt instructions for the same Storybook initializer flow on the install page.
• storybookjs/storybook#34450: Updates onboarding-related documentation for Storybook addon setup and initialization.

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[miachillgood]

Hi maintainers, thanks for taking a look. Could you please add the appropriate labels when you get a chance? I believe this should be documentation and ci:docs, since this is a docs-only change. Thanks!