feat: improve onboarding

[avitorio]

Summary

• Fixes confusing onboarding UX where "Confirm your Branch" was shown alongside existing singletons content
• Separates branch confirmation from content type selection by creating a new ContentOnboarding component
• Simplifies CollectionOnboarding to be a focused, reusable card component

Problem

When a user had singletons but no collections, the dashboard showed:

1. "Confirm your Branch" UI from CollectionOnboarding
2. SingletonsTable with existing content

This was confusing because if singletons already exist, the user has implicitly confirmed their branch by creating content.

Solution

Refactored the onboarding flow with clear separation of concerns:

Component	Responsibility
ContentOnboarding (new)	Branch confirmation + shows both collection and singleton options
CollectionOnboarding (simplified)	Just the "Create a Collection" card
SingletonOnboarding (unchanged)	Just the "Create a Singleton" card

Dashboard behavior:

• Fresh start (no content): Shows ContentOnboarding with branch confirmation, then collection + singleton options
• Has singletons, no collections: Shows simplified CollectionOnboarding card (no branch confirmation)
• Has collections: Shows collections grid

Test plan

• Added tests for ContentOnboarding component (9 tests)
• Added tests for simplified CollectionOnboarding component (9 tests)
• Updated existing collections.test.tsx to reflect new behavior
• All 139 tests passing

[changeset-bot]

🦋 Changeset detected

Latest commit: 5a245f3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
outstatic	Patch

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Project	Deployment	Actions	Updated (UTC)
outstatic-dev-blog	Ready	Preview	Jan 30, 2026 11:15pm
outstatic-docs	Ready	Preview	Jan 30, 2026 11:15pm

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
outstatic-advanced-blog	Ignored	Preview	Jan 30, 2026 11:15pm