Implement CSS animation detection for autofill

[codegen-sh]

Overview

This PR implements a technique for detecting browser autofill using CSS animations and the animationstart event. This approach is particularly effective in Chrome and other WebKit browsers.

Implementation

• Created a new useAutofillAnimationDetection hook that:
  • Adds CSS animations to detect autofill state changes
  • Listens for the animationstart event to detect when autofill occurs
  • Provides an isAutofilled state and reset function
• Added a Storybook demo that showcases the technique with:
  • Name, email, phone, and address fields
  • Visual indicator when fields are autofilled
  • Form validation using Zod

Technical Details

This approach works by:

1. Adding CSS animations that trigger only when inputs are autofilled
2. Listening for the animationstart event to detect when these animations run
3. Setting an autofilled state based on the animation name
4. Providing browser-specific animations for Chrome/Safari and Firefox

Testing

To test this implementation:

1. Run Storybook with yarn storybook
2. Navigate to the "RemixHookForm/AutofillCssAnimation" story
3. Try using your browser's autofill feature to populate the fields
4. Observe the "Autofilled" indicator appearing on fields that were autofilled

Related Issues

Addresses subissue 360T-606: Implement CSS animation detection for autofill

Part of parent issue 360T-602: Explore adding autofill management to form library

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💻 View my work • 👤 Initiated by Jake Ruesink • About Codegen
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✨ Finishing Touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/autofill-css-animation

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