Add nav-test pattern demonstrating navigateTo with self-instantiation

[tonyespinoza1]

Summary

• Adds a simple example pattern showing how to use navigateTo() to create new instances of a pattern dynamically
• Pattern has a text field and button that creates a new instance of itself with a custom name
• Demonstrates using Cell.of() for local state and handlers for navigation

Test plan

• Deploy to a space using ct charm new
• Enter text and click the button
• Verify navigation to new charm instance with the entered name

🤖 Generated with Claude Code

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Summary by cubic

Adds a simple nav-test pattern that demonstrates self-instantiation and navigation with navigateTo(). Users enter a name and open a new instance with that name.

• New Features
  • Added NavTestPattern in packages/patterns/nav-test.tsx
  • Text input bound to Cell.of() for local state
  • createAndNavigate handler creates a new instance and calls navigateTo()
  • Title uses NAME with str to include the current label

^{Written for commit 615c034. Summary will update automatically on new commits.}

[cubic-dev-ai]

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